Legend hands down
Mic - 6 enough to get you amped, but nothing great, nothing terrible either, it did improve greatly in the TNA era.
Ring work - 7 above average, nothing memorable, but most importantly nothing that took you out of a story or made you start to disbelieve what he was selling, stinger splash, the build up punch flurry in the corner, classic.
gimmick - 10 surfer sting and crow sting were huge era defining gimmicks IMHO.
Overall - 10 the man was the face of WCW, one of the greatest babyfaces of all time period, sting was on that level of Hogan and the elites for a long time and had legit crossover appeal.