^ Interesting.You had the complete opposite experience that I had, because Horizon on Insanity was just a pain in the ass. :lol
Since ME1 was all about the "open world", you could at least figure out ways to game the enemies. In ME2, I felt that it was all about kiting or exploiting the weak pathfinding.
For some reason, I had more trouble with the Horizon mission on HardcoreHard to say why, maybe bad luck with a Scion encounter
To be honest, I don't kite in ME2, ever. I'm switching cover positions regularly, but I rarely ever backpedal or backtrack through level environments during combat - so far it worked out (I'm currently about to enter the Omega 4 relay).
I kited those giant floating things that shoot lasers at you, mostly because my guys would always die if I didn't draw their attention.
Keep in mind that I stupidly started the game on Insanity on my very first playthrough, because I assumed I had as many options as I did in ME1... boy did Horizon prove me wrong (although, because of enemy scaling, playing a New Game+ on Insanity actually makes the game harder, so it worked out in the end). I was extremely lucky that I was playing the class with the power armor, because my teammates were essentially useless throughout the entire mission (whoever decided that there should be a limit on omnigel when the friendly AI is so bad must be shot

By the time I finished the game, I didn't feel like I figured out how to play the game - it was more like I figured out how to trick the game into letting me win... and that just isn't a very satisfying experience.