this, while i dont necesarily LOVE SADX (hell, i dont really love any sonic game) i still find it some good fun.
Sa2b on the other hand in my opinion, is so overrated, i could never find myself enjoying that game... The controls felt clunky, the level design was frustrating, the rank system was broken, piss poor graphics (even at the time of release) and i hated how you cant spindash in sa2 quite as fast as in sa1, after playing SG, i sure see how badly sa2 has aged IMO.
Now, for a game i like but people hate, well. Street fighter the movie the game (arcade) is the only on that come to mind for me