The Gamespot review says that even easy mode is too hard, where as part 1 can be solo'd effortlessly using only Nolan, and then 3 using Ike and Haar, and such... Clearly the guy was a dumb ass.
But easy mode in FE10 is a joke... not so much like FE8 or 9's easy modes, but still really easy. Normal's pretty good though, and Hard's insane.