I have to say, people slam Jet2's aircraft, but I can honestly say they are some of the most well looked after, comfortable short haul aircraft out there. I did a 3:30 flight to Dalaman in G-LSAA last year, it's 25 years old, but the cabin is in impeccable condition.
I've been on BA Airbuses half that age that have actually looked dilapidated inside. Dirty seat covers, yellowed lighting, dirty toilets etc. If the airline are looking after the aircraft they have, then why would anyone criticise?