One point to note about race to the bottom...this might be a legitimate argument for LTN and STN and anywhere else where LCCs make up virtually all traffic. Whereas MAN handles a number of premium carriers and airlines with premium passengers eg BA who surely expect and/or pay for better. So you’d have to conclude the issue is well and truly with poor management.
As an aside, STN which is of course within the same group yet is even more reliant on LCCs does not appear to be experiencing problems to anywhere near the same degree.