So, now, with the Moria expansion installed, I was able to check out the two new (OK, they're not new any more, but new to me!) classes, Warden and Rune-Keeper. Inspired by this post on Dub's Diatribe, I decided to try a Warden, and I'm quite glad I did - I'm finding the "gambit" system quite fun, and it certainly seems to be a unique mechanic amongst the many MMOs I've played.
The super-quick summary is that it extends the "combo point / finisher" system used by WoW's rogues, LOTRO's champions and WAR's witch-hunters by having three different colours of combo points. Different colour combinations lead to different finishers, starting off with simple two-colour combinations (e.g. green-red is "Persevere", an attack that also places a mild heal-over-time on me) and apparently builds up to mighty five-colour combos like green-yellow-green-yellow-green, "Conviction", which places a heal-over-time on your entire group and also transfers threat from every group member to you. So far the most complex ones I have are a couple of three-colour combos, it does a good job of gradually increasing your options, with a new gambit being available every couple of levels.
I'm currently level 17 on Marchomir the Warden, and have not yet died. So I'm closing in on the apparently fairly challenging "the Undying" title which is awarded for reaching level 20 without dying. Once I hit, I think, level 10, I decided this might be fun to focus on. I'll be happy to get it, but I will confess that as I get closer and it feels like more is at stake, it is sucking some of the joy out of the gameplay. I'm not about to flex my muscles trying to solo a fellowship quest with a risk like that. Oh well, it'll be over soon one way or the other, then I can cut loose!