Personally I think that any Grappling should be Cinematic, not the baseline "if someone has a higher athletics score than you, you can literally do nothing in the grapple but go get your friends some snacks and wait until someone rescues you or you have been inevitably killed."
The way I picture it happening is that the baseline grapple should be replaced by "Grabbed", a condition where you've just got a hand on somebody and you're keeping them more or less in place. You've seen it in movies all the time, the villain grabs the hero by the arm or the cuff of his shirt and starts wailing into him with punches, but the hero can still get a few good hits in or maybe flip the villain over. This condition would weaken the guy being grappled more than the guy doing the grappling, but they'd more or less now be focused on each-other in a fight. They could do a variety of benefits like trying to throw or trip each other, trying to take something from the other person, simply beating them in the face or stabbing them with a small weapon (as an attack check with a penalty if you're the grabbed guy, not as an Athletics Check), or things like trying to grab an opponent's arm and keep them from stabbing you (disabling them from using their weapons, but they can still headbutt you or knee you in the groin or try to break the grab in various ways.) This action should be able to be done by anyone since it just represents grabbing a guy and all it would do is mean they lose their attribute bonus to AC and can't move away from you unless they become the grabber or make a drag or something. This is where a lot of nifty effects would go that would be cinematic without gamebreaking, like slamming someone into something or tossing them through a saloon window. This would also be what people could use to get Zipcuffs on someone in a Spycraft game if they're not skilled, but since they're not fully skilled it would be pretty hard and would maybe require them to have the guy on the ground or have both of his arms held before you can attempt it. This way even someone without the grapple feats could grab a guy and start punching him, then snap some cuffs on him after a bit of a struggle (unless of course you just knock the poor sap out and you're free to cuff him however
Full-on Greco Roman Wrestling and Pinning is hard
when people aren't trying to make a show of it like on professional wrestling and I think should be limited to a feat chain. The first one lets you maybe grapple someone to put some harsher penalties on them, but still not completely
shut down their actions. They'd always be able to bite or knee or headbutt you for some damage, or maybe having an Athletics Check be what you use to gain control of the grapple (or in this case, simply go back to being "Grabbed" and let you hit your opponent or something) and an Acrobatics
check be used to merely escape it. This would be a much harsher penalty, possibly negated if you too have the feats (which would be interesting since two trained wrestlers would be going at each-other nicely without it always being "one guy is totally helpless and one guy is completely in control".) The sway of power would shift and they'd both get winded and bruised in the process. Maybe the feat that lets you grapple also lets you choose to inflict some minor subdual damage when you're grappled?
Pinned, now Pinned would be a fight ender. That's the point of being "pinned"; you're completely stuck to the ground and the only thing you can do is flail and -maybe- stab/bite someone with fangs, claws, or a dagger at a pretty hefty penalty. Pinned would be at the end of the Grapple Chain, probably with the middle just including some new cool stuff you can do in a grapple like a Suplex or a Submission Move that does hefty stress damage or something. The end of the chain would allow you to Pin someone, a move you can take from a Grapple (but not a grab) so that it takes a minimum of two turns being in the grapple/grab before someone super-skill can lay you out. I'd still say you should be able to use Athletics or
Acrobatics to escape the pin, but a Pin (being so intense and focused) should make the Pinner nearly as weak as the Pinned person. Perhaps make it even take three turns by having to be pinning a Sprawled or Prone opponent, as even the most skilled of wrestlers can't just slam a serious opponent right to the ground and make them completely helpless immediately.
Now, there should also be a trick that wrestlers gain that is their 'instakill' against Standard Enemies. Perhaps when they gain a Grapple Benefit (or maybe even a Grab Benefit since other chars can kill standards as a half action) they're allowed to either immediately instigate a pin against them (it's a standard, who cares if you're OP against a standard) or do some crazy ass wrestling move that causes them to immediately fail a save. It's basically like being Mike Haggar; against the little shmucks you can grab one, smack him around a few times, then break his spine with a suplex and move onto the next one. With the big guys the best you can typically get is a firm grab and some serious punches, maybe throwing him into something painful before he's back in the fight and able to keep going.
I like the ability to Grapple, I really do. I also love that FC has stuff for Wrestlers. Perhaps this would allow someone to build an entire character around being a Wrestler while also allowing the game to be more balanced and cinematic at the same time. You could have more sexy moves with Grab and Grapple (who DOESN'T want to throw a dude through a saloon window!?) while also giving more options for the grabbed and grappled person besides just laying there and taking it.
But that's just my two cents. Hope it helps. Also, you Crafty Writers are awesome for listening to us like this. You are quickly becoming my favorite publishers, second only to Paizo just because I am in total <3 with the Golarion Setting.