Well generally, I think everyone is going to look at Thor's basic mobility and see that they have a bit of work ahead of them. His dash is pretty much trash. His airdash can go in multiple directions but it doesn't go far enough to reach the ground at minimum air dash height. This, at first glance, would leave him in the category of someone like Hulk who's probably gonna try to super armor his way in or get his super jump on. Since Thor's super armor only comes with fully charged moves, the problems only seem to get worse, don't they?
Well if you're reading this, you either know that what I said above isn't entirely accurate or you haven't found Thor's approach pattern. If you fall into the second category, I'd suggest you watch a match of Justin Wong's Thor. He doesn't have a particularly good Thor but he understands the basics well enough to start you off. For the others, you have to understand how stupid good Thor's aerial Mighty Strikes. He covers alot of ground, lands with very little lag (enough to have an advantage over an opponent who blocks this) and can eat any non-super projectile through the duration of the time that he's moving. All this adds to his Mighty Strike being, by far, his best move for opening an opponent up.
Although he has a pretty good tri-jump game and possibly the best rewards off a command grab in the game, most of the time you're going to be barreling into your opponent until they learn how much priority Mighty Strike has and learn that they must block. THAT is when you can play Thor.
I'm going to start describing what that means in the nextpost.