Apologies for the 'RJ' slur. And I agree that irregular ops happen to everybody. But the fact that at least two of only about 15 E190s in the fleet had delay-causing mechanical issues yesterday indicates that the performance problems have not yet subsided.
Further, unlike the DL and US shuttles, B6 does not have aircraft in reserve to deal with these issues and save passengers from long delays and/or misconnects.
It is a comfortable aircraft. I won't deny that. But the performance issues continue to be a serious problem which is impacting passenger attitudes. (You shoulda heard the rage at BOS yesterday. Several pax just threw in the towel, cancelled their trips, and asked for refunds. I doubt most of those will be back.)