Pleasant:
Th13teen was a surprise for me. I only rode for the first time last year and I guess after two years the silly amount of hype AT had but into their advertising for it had faded from memory. On top of that, I originally thought the free-fall drop wouldn't be as forceful as it was and was expecting it to disappoint me but I really enjoyed the free-fall section and everything that happens after. My girlfriend and I re-rode this several times and is a favourite of mine at AT.
Unpleasant:
X:/ No Way Out; I went onto this ride expecting to feel a great sense of
"Woah, WTF is goings on? This is crazy/weird "...
...instead I came off thinking,
"Wait, did I really queue an hour for that ride? At least it has stopped raining out here " .