Moore was another big miss, but washing out of the NFL after a couple of years is my expectation for most late-round picks, so I would give a pass on Larsen and Black.
I would say mediocre (if Flowers wasn't a bust) because Tillman, Morris, and Polk have had longer than average careers, and Tillman has been a marginal starter at least most of that time. As it is IMO it's the misses on Flowers and Moore that make this one of the poorer drafts on record.