Don't worry about the infinite.
1. Pikachu must Thunder Wave at a very punishable distance. If you shield he's in a bad position and he cannot simply get the combo going by hitting a Thunder Wave from anywhere.
2. He also has to give up his UpB for a worse version of it, which no Pikachu is going to do.
3. I haven't tried it, but the combo looks really hard to do (at least consistantly) because it requires a lot of precision.
I mean, yeah it's dangerous, but you almost never will face a Pikachu with these customs, and the combo is both hard to pull off and to keep going.
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I haven't faced enough Pikachus with Pac to give a real opinion on the MU, so this is mostly theory:
1. Pikachu is good at gimping, but Pac has a good recovery, so it shouldn't be too much of a problem. Pac is good at gimping, but Pikachu has an even better recovery than us (in my opinion), so we won't be gimping him either. There's not much going on offstage. Maybe we can fruit or hydrant him from the stage, I guess?
2. We can block his projectiles; he can unreliably block ours. He has nothing to gain by staying far.
3. He can rack up a ton of damage really quickly at close range, we can't. Being too close is not good for us, and this is what he'll try to get.
4. We both have problems killing, and no gimping makes it even harder.
4. Trampoline OP.
5. Maybe 55-45 Pac. It's pretty equal. I can still see why Pac has an advantage, but I don't think it's that big.
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Nu~
Ready to move on. Also, will we re-do some characters because of the patch? Diddy plays a lot differently now, Sonic lost a kill move, and Sheik can't just abuse her Bair. The MUs don't change too much overall, but these are all things that make our life easier and change a little how we approach things. Maybe not doing a whole week (or 5 days or 17 or whatever it is now) on the characters, but just making quick adjustments. Or we could discuss that in the more general MU thread and incorporate it in the first post here.
EDIT: 200 posts, woot. I'm a Journeyman now.