I've had just enough bad experiences flying with a large enough variety of airlines that, at this point, I'm not going to make any claims about how I'll never fly a particular one again.
In the end, they all stink for one reason or another, because the system of air travel overall just stinks. Flights are all overbooked or delayed or whatever. They all misplace or delay luggage, even when you've checked to make sure the destination airport code is correct. They all run on such tight schedules that even a small delay can throw the whole schedule off. They all have pretty poor customer service, horrible refund policies, and just in general are a headache to deal with.
Given all that, I pretty much just assume that checked luggage has a 50/50 chance of actually showing up at my destination at the same time as me, things will very likely be removed from my bag, security will be a pain to get through, the flight itself will be (at best) an exercise in endurance, and there won't be any food or entertainment available to speak of unless I bring it myself. Basically, I expect the whole experience to be awful, so that when bad stuff inevitably happens I am at least somewhat prepared to deal with it. I am also, at that point, pleasantly surprised if the worst thing that happens while I'm traveling that I'm bored and cramped from not enough space.