Sorry Sheik got nerfed so hard. I feel Nintendo should have removed bugs, (i.e. Shadow Sneak Cancel), but not nerf characters that are already strong and balanced. Buff characters so that they are able to be competitively viable (i.e. Ike) because that helps the meta. If one character is unfairly strong (i.e. Brawl MK), then nerf it, but if a character is strong, but requires training and skill to succeed (i.e. Little Mac, SSB4 Shiek, Snake), then leave them be. That shows that the character is well designed. Remember, there will be future patches, so Sheik could be buffed again. Stay strong, guys.