I'll be going for my usual opinion style, here. That is to say, I'll probably end up talking more about the technical aspects than most people would.
OK, the concept was interesting. I never would've thought of doing that. I thought it was delivered a bit awkwardly at times, but still entertaining overall.
Now, I generally don't suggest this to people, but this is one of the few videos I've seen that could actually benefit from a few effects added. That isn't to say I'd want a bunch of flashes in their or anything. Rather, I would've like to see a bit of masking. Personally, I would've masked the faces of various members of The Big 5 into the corners of the parts where it showed their opponents.
Your lip-sync was fairly accurate, but I recommend using more than two frames of lip flaps. That is to say, I usually use an open flap, a half open one, and a closed mouth when I lip sync. That's usually all you need. Now, there are a few more complex guides to lipsyncing in Vegas, but I'll leave that up to you. I'm just giving a general overview.
As for the overall visual quality of the AMV, it was alright. Not horrible, but not the best quality I've ever seen either. Some parts were noticeably blurrier than the rest. Which again, is why I bring up using Zarx2464gui for exports and using either DVDs and/or x264 encoded 480p raws for footage. I noticed the aspect ratio switching up sometimes as well. It's usually best to stick with one aspect ratio, even if that means cutting of the edges to fit in a 4:3 frame.
Overall, not a bad video. Worthy of a 7/10 on my scale