I absolutely loved all the incarnate trials and content. All of my 50's were maxed with various T4s for each power. I truly can't wait for CoH to come back ... I miss BAF, TPN, MOM, and MAG trials so much.
I didn't mind Lambda or Diabolique... Didn't care for Keyes...and did not like Underground at all.
Me to, i was able to get most of my characters a full load of incarnate powers. I think the TPN trial was my favorite, as it had a solid reward rate and also had a good gameplay pace. It was also reasonably doable to avoid the instant death attacks Maelstrom would launch on the league since it was detectable.
As for my second favorite trial, Probably the LAMBDA, BAF and MAG trials were my other favorites. They were well paced I felt, I only felt the LAMBDA was semi bothersome on a mastermind, BAF was done a hair to commonly to be my favorite and the MAG trial people liked to refuse to do the entire thing and finish it, which annoyed the heck out of me.
MOM fell behind the others due to how people acted with the trial. It was a fun trial itself, but I encountered the most elitism with that particular trial. I also encountered a lot of elitism with the Diabolique trial, and was left hateful towards some players, even, over it.
As for my most hated trial, it was the Underground trial. It was laced with some fake difficulty in that the targetted was something many people didn't know how to deal with. It was a subtle enough graphic that idiots sabotaging it intentionally or otherwise couldn't be kicked likewise because they couldn't be detected to stop disaster. And I get a feeling trolls loved to sabotage that one alot, heck one idiot used rebirth one time while confused on the end boss.....yeah....