I might be the biggest WCW mark in the world. Hell I even watched TNA because it was WCW lite for a while. Such a mark, that I prefer Tony Schiavone to Jim Ross as he's responsible for some of my favorite wrestling moments. That said:
1) Sting doesn't suck, but he's way overrated and really the reason the NWO lost steam. I know it ran for like 2 years but could've ran longer (or had a better ended) if they actually had a legit force on the other side that was considered "cool." Sting sucks on the mic and was never considered cool by anyone.
2) As a lone entity, DDP would've been better as the WCW savior than Sting.
3) If they wanted a group, the Horseman (Flair, Anderson, Benoit, Malenko) could've done just as well if given the Sting build. (I know they had a program). Could've also been used to build up Benoit and Malenko.
4) Sting is just like Bret Hart, safe but nothing spectacular. He's like Cena without the (negative) energy.