I just never got on with them, I got stuck at start of a few of them as the puzzle solutions seemed illogical. I think if you completed one you'd know how things work but since I was late to the franchise I was flummoxed at how things worked. In Lego LOTR's I got to the town near the start (in the movie where the prancing pony is)and literally have no idea what to do, I had no instructions what so ever so just gave up after running around for 10minutes.
I had the same with Assassins Creed 3, having not played an AC game they didn't have a proper turorial and at start it has a fight and says "hit attack" but not which button attack is, then "use parry" without explaining WTF was going on, I was infuriated!