I think the problem which some people have is seeing one dimensional as a big insult. Most players are one dimensional. Berdych himslef is every bit as one dimensional as Nadal. There are few players in the top 10 who aren't to be honest. Federer, Nalbandian and Baghdatis are the only guys who can definately be said not to be one dimensional.
berdych is not one dimensional
he has great groundstrokes.
he can volley and come into net
What other dimensions are you speaking of? he cant play great defense, and his movement isnt the best...but other than that, he has shown the ability all over the court.
as far as the groundstrokes are concerned berdych does hit the ball flat, and doesnt use the slice. but nearly all of the players play one style.
for example, safin is considered to be multi, but he hits the ball very flat and rarely hits the ball with much topspin at all. In fact, many of the great have had a traditional way of hitting the ball. sampras eastern fh meant he hit fh's with very little spin. So is he one dimensional too?
if you are talking about the ability to strike the ball differently, only federer and nalbandian are the top players who can do this. if you talking about all-round ability, as in weapons vs weaknesses, quite a few have a multi-dimensional game.