Yeah, MVP's finisher is terrible. The Playmaker is a great name for it, but it's a terrible move. Apparently when he was wrestling in the indies his finisher was the Crippler Crossface, renamed the T.T.B. (Take it To the Bank/Tribute To Benoit), but obviously it'd be a bit difficult to have him do that now. They should give him a TKO or something, that's an awesome move and no-one since Marc Mero has used it IIRC.
I think the Playmaker as it currently looks is supposed to be like a neckbreaker, only done with the leg instead. Except he just rests his leg there and doesn't grip their head at all, so it looks awful.
As for Big Show, I can definitely see him showing up on SmackDown! soon. I originally thought he might be a mystery final entrant into the Chamber on Raw, but the Raw roster is just too stacked right now. Wouldn't be surprised at all if there was a Battle Royal for the title match at No Way Out on this week's SmackDown!, with Show turning up, winning and facing Edge for the title. Alternatively, I'd like to see a Rey vs Edge Ladder Match for the title. That'd kick arse.