Jenkins' Inhumans was phenomenal. His Peter Parker: Spider-Man run was pretty good for the most part, especially his little one-off vignettes (although he did create Typeface). But when he shifted focus to more traditional hero vs. villain stories for Spectacular Spider-Man, it started to suck. Origin was decent at first, but I lost interest in it halfway through and stopped reading it. Wolverine: The End was terrible, according to everything I've heard. His first Sentry mini was good. His second Sentry mini was not. Frontline was stupid. Civil War: The Return was a useless waste of space, but that's more because it was poorly executed from start to finish, so the blame rests on many other shoulders besides Jenkins'.
So I guess I'd have to go with Leaguer and say that he misses more than he hits for me, especially lately. According to Wikipedia, however, he worked on the God of War games, so I guess he can't be all bad.