In that video his frame rate is constantly below 60 also his animations suck.....
Hey, no need to be offensive about someone's work just because they're using a potentially competing program. Surely how good your animations are doesn't depend on the tool you use?
I may not agree with the philosophy behind Stencyl, but hey, it's a free world and each to their own. I want to make sure these forums are always a friendly place (which sadly seems quite rare on the internet) - ideally someone from Stencyl, Game maker and such could drop in with a few posts without being shouted down.