I think you should actually read up on the fighter in 4e. The role of the fighter is much different than in 3.5, so trying to compare it is pointless. The same can go for all the classes. 4e is enough removed from 3.5 that we are talking about totally different systems. It may have some of the same terminology, but it's completely different.
If your really interested in comparisons you need to look at the Pathfinder fighter vs the 3.5 fighter. Then you can see the short of it.