Well season 3 isn't fully subbed yet so I'm not finished, but from what I have seen it's easily the best season of the show so far. I'm not sure if 4th and final one will be able to surpass it, but if it can then that's great.~
Mmmm no. Ryou becoming a guy completely obsessed with winning isn't why, though it's kind of a shame the guy has become that way despite what he was in season 1. I really like his cyber deck though.
But no, I don't like the 2nd season because a few of the characters are pulled over into the society of light and become annoying. There's just something about their attitude that really ticked me off and detracted from my enjoyment. I like Saiou though, very enjoyable antagonist for the kind of show Yu-Gi-Oh GX is.