I've never seen/heard Lovano play anything close to a poor concert--and I have probably seen him more than anyone. I have tons of his records as leader and sideman. There are some leader dates that didn't work so well (very few), but overall his output his very impressive. Lovano can play his own material, can play a bit "out," and he is masterful on standards.
I do find his recent ECM records to be overly low-key, and maybe this new group hasn't quite gelled. I'm kind of intrigued, though, as I have started to enjoy Julian Lage.