Where does it state Thor has FTL reflexes? I know he is faster than light, when he travels, but that is not when he is flying. He uses the Hammer to fly, and the wind to maintain hovering, last I checked wind is slower than light. Also to have ftl reflexes you need ftl blood, which is not true with Thor. No one's blood is even close, that would mean the time it takes his brain to tell his body what to do, it would have been almost before he even thought of it. DOESN'T make sense. He has magic that allows him to do that, but I haven't seen one Thor of him being able to move even close to Kid Buu's power. In fact 99% of the time he doesn't. Look at Hulk fighting him, Hulk hits him. Everyone hit's Hulk. If he was that fast, people wouldn't even try to mess with him.
Kid Buu is not going to get hurt by a GodBlast. IT will blow him up, but most of the power will be wasted as he would just mold again. People forget Kid Buu id essentially Plastic Man, but better. Kid Buu is immortal just like Thor, he can stretch any limb/part of his body, turn himself into a doughnut to avoid blasts, each part of his body has sentient life. He can make copies of himself, like people say Darkseid can, and have all their power (unlike Tien) Kid Buu will learn any technique that most can do by just looking at it. Not like Taskmaster, but actually do the move. So I am sure he can do a heat vision, or a Super cold breathe, I am sure he can even do magic attacks, as he is pure magic.
Kid Buu might not be stronger than half of DC's roster, but he is more durable, has more stamina, is willing to destroy the planet without thinking about it and can Teleport via IT. IT= able to go to any planet with energy and destroy it and not even be in the atmosphere, he will just shoot it out. I think even Apokalips will survive the explosion.
Notice how Thor apparently manages to fire off his own attack before the so supposed "instant" telepathic attack of the phoenix (those kind of attacks are pretty much instantaneous). Not to mention... he's apparently capable of swinging his hammer at the speed of light to beyond, which suggests, as he's actually performing the act of doing so, that he could move, combat wise and this is supported by my scan, that he is light speed to beyond. Oh and one more thing... Thor was a bit groggy when he performed that in the scan, which makes it all the more better in his case.
Marvel Man's stated the reason why the Hulk can hit him. Thor is an honorable warrior and does battle with the Hulk on even footing. Its also why he doesn't use his other powers on the Hulk so much.
Thor has matter transmutation. He could, if he so desired, turn Majin Buu into a cloud of vapor, with no chance of returning back to normal form. I'm pretty sure he couldn't do a Godblast. Because that uses the lifeforce of Thor's in order to do it. I'm also fairly certain Buu is limited to ki attacks. Because I've not seen anything that suggest he can expand beyond the range of ki-based techniques, and just using the fact that Buu himself is magical is not enough to substantiate that he can do anything of that sort. After all, the heat vision and the super breath is something that's related to the physiology of the Kryptonian, its not a technique.
He isn't more durable. Durability is considered that you're able to take attacks and not be damaged. Buu's had parts of his body annihilated. That's not durability, that's regeneration. And Thor has Stamina that I'd say is on par, considering he's been shown fighting for months against Frost Giants nonstop at full exertion.