MAN may have a good route network, and good ground access (M56, train, bus and maybe Metrolink one day if common sense prevails) but the airport process bit itself is very hard to use (getting the right terminal, finding your car park and a space in it, navigating the endless level changes, corners, confusing signage/retail messages, broken travelators, lengthy baggage waits, over-obvious Immigration and Customs, congested arrivals, broken/dirty toilets, expensive coffee served at dirty tables etc etc).
Other airports e.g. LPL, EMA, Finningley etc. have rapidly increasing networks and are a joy to use, being simple, level and easy.
Airports today are like the car industry in the 70s and 80s: MAN is the British Leyland of airports, whereas LPL, EMA etc are the Japanese/Malaysian manufacturers. Complacency/complication/unreliability/fat cattery versus efficiency/simplicity/customer focus etc.
Perhaps EMA should have bought MAN and not the other way around. Oh how I feel sorry for the EMA staff who got lumbered with the dead hand of Manchester Airport Group.