In my experience, really good. Ike's crazy hitboxes means that you tend to always have a follow up from your throws if you can react to DI properly, and Fthrow -> Fair, Uair or QD -> Fair/Uair are close to guaranteed finishes at kill percents on the various floaties. Even Ike v/s Pit doesn't suck. You'll probably still have M2 issues, but who doesn't?