1.The souvenir - Wade Barret performs is beautifully! It's a fresh finisher that we haven't seen a thousand times (or ever before, that I can recall) and it looks like it would really kill!
2.Cesaro's uppercut - Holy fuck it looks awesome! And there can be so many variations of it!
3.The blackout - Just an awesome finish! Looks killer!
Funny story, as much as I like Seth Rollins, I can't stand his finisher. The Blackout is just...a foot stomp. And not a very convincing one at that. It's not that he executes it poorly, it's just the kind of move you'd see Daniel Bryan use in the middle of his set. Also, Cesaro's uppercut isn't actually a finisher, to my knowledge. I'm not a huge fan of Barrett's Souvenir, but it's better than Wasteland.
I don't know that these are the best, necessarily, but they are a few that came to mind. There's also not three, because...fuck the police:
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Kevin Steen's package piledriver is not only brutal, but it tells a story. Any finisher that gets banned because of brutality (and I mean ACTUALLY banned, not just for a night like Sheamus' big boot), and then later brought back has that added effect. Steen's is one of the best in the business, and I don't even much like the guy.
Trouble in Paradise is the most consistently well-performed and most exciting move in WWE today. Kofi hits it spot-on, and even when it's slightly messed up - cough, Miz - it can be even more devastating. I'm a huge fan of moves that come out of nowhere, which also leads to...
Beautiful Disaster. Cody is a great in-ring talent, and the B.D. kick is the perfect icing on top of his cake. He can pretty much hit it anywhere; I've seen him use steel steps, announce tables and barricades when ring ropes aren't available. It's devastating, sudden and believable. Couldn't ask for more from a finish...
Alberto del Rio's cross armbreaker is likely the most believable submission in pro wrestling. That's right, I said it. Even with the "NO! Lock" and Anaconda Vice on the scene, del Rio's finish is better. It looks so incredibly violent, and unlike every other finisher that gets locked in every week, I don't just sit there bored, wondering if/when they'll tap out.
Five Star Frogsplash! The whole F'n show! Rob Van Dam hits this move better than anybody, except maybe Art Barr. It's pretty much the highlight of all his matches too, which between you and me, is saying something. The height he gets is ridiculous, and unlike the normal frog splash users, Van Dam doesn't give a damn where his opponent is located.
And now on to some of the worst...
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I know this is probably not a popular opinion, but I don't like the GTS. Somebody the size of Punk shouldn't have a move he can't hit on anybody, at any time. Especially if he's going to be in the main event for a long time to come. I would love to see him some sort of ROH-style kick combination finish. Maybe a big running knee, courtesy of Davey Richards. KENTA is badass when he uses it; Punk's look sloppy and ineffective half the time. Just my opinion, but I don't like that move on that wrestler. Simple enough.
I also flat-out don't like the scissors kick. The guy/gal taking it (like a bitch) has to bend over for like five seconds, looking really stupid, until he gets planted with a ax kick he/she could have avoided easily. It's not so much Alicia Fox's fault, as the move in general. Don't like it, never have.