Don't worry, it won't turn into one of those dreaded heated discussions. For that you need two or more different sides arguing with at the very least an equal amount of credibility. Now, I don't know for certain, but I would bet my left AND right nut that you've never played UMK3 competitively, or have seen it played. Based on that premise alone I shouldn't be "arguing" with you. But I have insomnia and I don't really have much restraint at the moment. Boredom also is playing a factor.
Anyway, on to your next "point". There's infinites in UMK3, which you seem to find that means the game is imbalanced. This is the only thing I can infer since you don't explain why the infinites in UMK3 specifically are "bad", also further proving my assumption that you've never actually played the game outside of beating your 'lil bro back in the day. This is also assuming your older than 10, which I simply cannot rule out that possibility. So now you've already said it's broken, imbalanced and that since it has infinites it's automatically a bad game, while providing no justification for any of these claims. They are because they are, more importantly, because you say so, right?
Show me a true high level match where any of these combo's are being performed on a consistent basis. Not that these combo's are necessarily difficult, but to actually land them on a high level opponent makes them impractical. The situations need to be perfect for a lot of the combo's performed in the video. Of course, the infinite's like Kung Lao's requires only a spin. Yet, we rarely ever see someone get hit by something as simple as a spin in UMK3.
But you know all of this, correct? What with your whole 4 minutes of experience and all.