It helps somewhere, and it also takes away somewhere. I can easily beat a Pokemon now by specifically targeting its weaker stat. My Pokemon often carry both types of attacks,so, I'm always prepared. However, some Pokemon got screwed over. Weavile would've been a good addition to my team, if it Sp. Atk wasn't horrid. Since the only useful Ice STAB-s for it are Special attacks(chain-breeding to get Ice Punch is not an option), it's a disaster. Weezing's STAB moves were classified as Physical before, and that's why Sludge did horrendously big damage to anything. Now, they get power from the Sp. Atk. stat, which means Sludge won't cut it anymore. and I have to raise the stat, too.