I guess that I never considered Berrios an ace or a bulldog. I view an ace as a stopper that I could depend on without question to stop a losing skid and to take the ball every 5th day. With that said, there simply aren't that many aces in today's game. I like Berrios and think he's a good pitcher that I wish were still here, but I don't see him as anything more than a #2 starter on a good staff. He's one of those "staff aces" that he can anchor an average or poor staff, but not a good playoff team staff. A true ace can dominate a playoff game, and he's been outdualed his fair share.
All that said, he was dependable and could be trusted to take the ball every 5th day. But I never looked at him as a true stopper or a guy to even give the bullpen a day off. Still, I'd rather have him than not.
Admittedly, by that definition, a true ace is probably a dinosaur I'm today's game. But there are still several left.