Fair enough AL, you are entitled to your opinions.
Have you tried any other terminal at MAN?, we have 1 and 2 you know, not just 3.
Every airport has its problems, up until very recently LPL had issues with security queues to the point Easyjet publicly humiliated LPL over it.
Just for the record, T3 does have a bar, even has real beer pumps and everything (amazing that!), so you dont have to drink 'canned beer'.
Your main gripe was having to walk outside, so im guessing you arrived at the transport hub, and im also assuming that for whatever reason, you chose to ignore the free bus that links the terminals and rail station, thus evading the cold.
In terms of metrolink, as you say its the Oldham-Manchester line thats your main gripe. I hardly see why its MAN's fault for that, its not their decision to do it.
So, to sum it up, maybe you were just having a bad day that day?