Hi - I mostly stick to AA, but for vacation I flew SEA - MCO and CO was a few hundred dollars cheaper than AA, so it was an easy decision. I connected through IAH in both directions.

The trip just didn't go smoothly. Lots of small things went wrong:

They forced me to gate check my bag in SEA because, though it fit into the bag checker thing, I had to press on it with fairly low force to make it go all the way in, due to my roller's wheels not being flush with the back of the bag (the rest of the bag easily dropped in with gravity, as I as not at all over packed). Nobody bothered me about it on the way back (even though I had picked up a few things and hadn't packed as well, so it was bulging significantly more). It fit in the overhead compartments without any problems.

Bathroom doors had to be completely manhandled to be closed. I encountered this on both SEA - IAH and IAH - SEA (the only times I used the bathroom). The first time I thought it was a fluke, but the second time?

Three of my four flights were delayed:
IAH - SEA by about 30 minutes (no explanation)
MCO - IAH by about 30 minutes (no explanation)
IAH - SEA by about 100 minutes (mechanical issues, something to do with door, had to switch planes and gates)

No complementary movies. On SEA - IAH, IAH - MCO, and MCO - IAH you could pay for the directtv access (I could be remembering wrong and one of those flights may not have had directtv). On IAH - SEA they played a movie on the fold down screens and gave out headphones for free to apologize for the 100 minute delay - but the headphones they gave me were broken (easy fix) and my chair couldn't even get the right channel (hard fix).

edit: forgot to mention one last thing: on IAH - MCO the flight was about half empty, but the FAs were not letting anybody change seats to empty seats. So there were entire bulkhead rows sitting empty. Maybe this is a policy, but that just struck me as downright nasty.

Any of these things alone would not be that bad - but when combined? I really just don't see myself flying CO anytime soon... Is my luck just god awful? Am I being whiny?