I know it gets a lot of praise, but I'm sort of on the fence about the ROTS novel. On the one hand it does a great job of getting inside the various character's heads and portrays a seemingly more coherent narrative. It also very wisely avoids portraying the more elaborate or drawn out action scenes (it skips the crash landing in it's entirety!) A trap even the normal novels often fell into as their authors fail to realise that action scenes in prose form are almost universally boring, for much the same reason that exposition heavy cinema is typically dull; It plays directly against the strengths of the given medium.
On the other hand the repeated references to EU events that it portrays as integral to the plot, yet entirely absent from the movie is something I found more than a little jarring. Plus it's portrayal of General Grievous was nothing short of gratuitously violent. One can barely believe it's even the same character. In a weird way he's even more ridiculous than the more broadly villainous version from the movie & TV show. Even the (admittedly cool) version from the micro-series didn't make him out to be such a blood thirsty psycho.
I think the TPM book took the optimal approach by just adapted the movie as if nothing else even existed. As a result I feel it's aged much better than either AotC (which I found largely forgettable) or RotS.
Yeah, that's kind of a problem with Star Wars as novels, the battles don't work well as written word. Both major space battles from the OT, Yavin and Endor, were some of the most boring reading I've ever done while the scenes are among my favorite. I remember at one point in the RotJ novelization the writer seemed to kind of give up and just had a full page of back and forth pilot banter without any attempt to describe what was going on. The guy was like, y'all are gonna see the movie and get the idea, it's kind of hard to describe. There are some exciting space battles in the EU though, written with being a novel in mind, but the novelizations I've read seem to have a hard time adapting the screen action to book action.