A good expansion... when it was new.
The planet, Kashyyyk looked beautiful and still does. The quests were fun and really brought some life to the game. The paths were a bit of a pain but I didn't really mind them too much. I think the paths fit pretty well with Kashyyyk, actually, though paths wouldn't for any of the other planets.
Of course, this was all before the NGE hit and ruined everything. This is a good expansion pack, there's no doubt about it. However, it has one major problem... it has no replayability. Once you complete all the quests on Kashyyyk-- which should take a few weeks-- there's no reason to ever return. Once the quests are done there is no reason to ever go back to Kashyyyk. In my opinion that's a waste. And no, since the expansion pack launched the Devs haven't added any new content to Kashyyyk. Some bugs have been fixed, but no new content which still means there is no reason to return.
Before the NGE this expansion pack was optional, but once the NGE hit you were pretty much required to buy this expansion pack if you wanted to level up and a somewhat more reasonable (though still extremely painful) rate. Perhaps yet another bad marketing ploy by SOE.
All-in-all, before the NGE hit, "Rage of the Wookiees" is a good expansion pack and was a lot of fun.