I truly enjoy the Splinter Cell franchises. Up until this one I have always found the game challenging, yet possible. I couldn't get used to the controls which made it less appealing but manageable. However by far the worst part about the game wasn't that it was too difficult or that the controls sucked, but that if you failed the mission there weren't any checkpoints you just had to start the ENTIRE mission all over again. Which is extremely frustrating if you keep failing the mission at the very end of completion. For example after completing 2 of the 3 waypoints I still had to start completely all over again.
I never played any Splinter Cell games, but I have seen a lot of them played. But as for this particular game it's so fun! And super stealthy "Well thats how I played the game." But Overall I enjoyed the game for it's Solo/Co op play.