If, by some quirk of the schedule, we played Atlanta in the ECF, we would have destroyed them. The fact that the series went to 7 games had a LOT to do with the C's underestimating the Hawks and also really being out of synch after having cruised through the past month.
OTOH, had we faced either Cleveland or Detroit in the first round, we'd probably be sitting around yelling at Doc Rivers still never having taken a team beyond the first round.
Atlanta might get a little bit better this year, but it'll be because of Josh Smith and Al Horford, not because of Mike Bibby. Bibby's done, toast, kaput as an above-average PG. He's not terrible (yet), but he's no longer good enough to be the starting PG on a team with any serious playoff aspirations. IMHO, of course.