Noah was never and will never be a suitable replacement for Jon Stewart, but over the past several months, he's grown on me. He's actually a pretty funny dude (his segment on Ted Cruz's affinity for canned meat was great), who does surprisingly good impressions.
My biggest problem with the guy is that he doesn't seem to actually know much about politics. You could definitely tell this by watching his interviews with conservatives. Stewart would actually push back when his guests tried to bullshit him, but Noah just nods and moves on to the next topic. He doesn't seem to know much about the subject beyond what his writers give him.