The three phases are rather distinct;
Phase 1; Bury-M'cr-Altrincham effectively replaced heavy rail with just the odd extra stop. It was however, partly responsible for the loss of the odd peak only service from Hillock/Unsworth to Manchester, and the evening 263. The latter was re-instated with "KickStart" funding some years later.
Phase 2: This was mainly in line with the development of Salford Quays and its impact on Eccles-Manchester buses was initially minimised by its rather time consuming indirect routing.
Phase 3; Apart from new direct links from the Chorlton area to Wythenshawe and the Airport, this phase is little more than direct competition for the commercial bus industry. Most obvious of all being the Ashton service which not only shadows the 216 bus route for 90% of its length, but has longer journey times than the limited stop 236/237 had before construction of the new line began. Phase 3 obviously divides he market because it gives car owners and people with good physical health (or just lucky enough to live near the stop) a choice, but leaves car-less, less healthy people at the mercy of a declining bus service.....which surely must result in a combination of greater car ownership (and therefore, use) and greater soci-economic exclusion, in the long run. In the old days, Limited stop/Express buses complimented "stoppers", so lets hope that, with Bus Reform, this is how Andy Burnham (and his successors) envisages a "post-competition" network.