I think that to a certain extent, Drake is a good team (you don't win 21 games in a row without being a good team, no matter the quality of the conference you play in), but to a certain extent, it's based on "smoke and mirrors". The backcourt is very talented, but they don't have much of a frontcourt. Their advantage (at least until last night) is that they always made the big plays and hit the huge shots when they needed to and they execute very well in the endgame (once again, until last night).
I think they'll be alright, but I would be surprised if they beat Butler on the road. I would also not be surprised if they lose early in the tournament if their three-point shooting deserts them.