Personally, I have never had any problems concerning MAN themselves (afew airlines though!
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MAN keeps getting voted, and is viewed as one of the best airports in Britain, and I can't see why if they have the problems everybody is experiencing!
On the pax declining point, MAN need a major Loco like EZY, FR or AB! Yes, BE offer an excellent service from the airport, but their a/c (DH4s) have less than half the seats of an EZY A319 or FR B738! With EZY and FR large at LPL, maybe MAN's only hope AB, unless LS is to grow beyond belief!
Maybe flyZOOM can revive MAN? They are starting at LGW this year, maybe MAN next year?