I hate FireRed and LeafGreen. They didn't add much new to the game and just made a rushed rehash of the original Red and Blue. The music was awful as well. Spriting was great though, I'll give it that, but they could have given these remakes more attention imo. The Sevii Islands and Ruby/Sapphire quest weren't really enough. I mean, look at all that was added to HGSS. Now, you might argue that this didn't happen because GSC were longer games and were missing a lot originally, so there was a lot of room to play with on HGSS, but think about it. HGSS at least let you get some new evos, like Yanmega and Tangrowth. You couldn't even get Crobat or Blissey in FRLG, and it was really damn annoying having to watch it attempt to evolve all the time. Nintendo logic says Golbat can't be Crobat because your POKEDEX, just some electronic Pokemon encyclopedia, doesn't allow it. Yeah. Makes a lot of sense.
I could rant more, but I'm not really in the mood. But that's just my opinion. At the time of their release, they were great. I just eventually got to where I realized I would rather play the original because they didn't do the original games any favors. And changing gamblers to gamers! Absurd!