I played LOTRO for about 9 months after launch. Though LOTRO didn't do many revolutionary things, I enjoyed the gameplay and the fact that I could mix solo and group play without falling too far behind others in my kinship. But the game really started to feel like it was becoming a grind -- mainly because I was playing so many alts, I kept doing the same quests over and over.
I'd been thinking about the returning to the game and came back when a free weekend popped up. It's been 3 or 4 months (or more, time flies...) since that free weekend, and the game has really grown, so I've stayed and have been having fun (I decided to focus on only two or three characters so my gameplay wouldn't be so repetitive). There have been so many changes, mostly to the positive. They've revamped class traits, crafting, and of course class skills.
I really enjoy crafting where I never really did it too much in other MMOs. I am actually able to craft items that I can use. I do need to put a little effort into crafting to do this, but it is far from the effort most other games require of you to make anything worthwhile.
Also, I play mostly with a friend and we're able to do most of the quests that we find, even many of the group or elite quests. There's a few that we run into that are over our heads, but we're not against grouping, so we get those done too when we are feeling brave and join a pick-up group.
Turbine also keeps things interesting with many free additions and seasonal themes or special events. If you're not interested in an event, you can skip it since its usually fluff, but most are fun enough that you won't care.
Though the leveling curve may not be as fast as other large games, its faster than at launch due to the Mines of Moria expansion release. The increase in leveling speed is fast enough that you notice it, but not severe enough that you'll outlevel friends playing solo for a session or two. As for Moria, it is an amazing view when you first enter. Legendary weapons are addictive fun (and slightly remenicent of what DaoC did with Trials of Atlantis, but done in a much more balanced fashion - everyone gets them when they first enter the Mines, though you'll need to run through some quests to get to that point).
Finally, I'd like to say that to enjoy any MMORPG is to group with a friend or someone in your kinship when you can. You don't need a full group to do most things in LOTRO, and it's always more fun to share the fun experiences as well as the few frustrations you'll find. Besides, the heroic stories are always more convincing when there's someone there to back up your tale. Not saying that you're a liar, but