Yup, the split was why I got into competitive battling in the first place. Some pokes that got nerfed on the top of my head would be Snorlax, losing Shadow Ball, and Gengar losing Ice Punch... I think.
I was playing Emerald Randomizer a while back and was so glad to find a Gengar, then I realized Gengar sucked because of a lack of special STAB. It was easy to switch forward, but hard to go back.