Shukar answered most of your questions well, so I'll only touch on the PvMP one. I think the PvMP activity may depend on the server. I haven't played for a few months, but for the previous year before that, Landroval server had a decent amount of PvMP activity most nights. I've played on the PvMP on Landroval since 2008, and there has been a decent amount of turnover in names and players. But in terms of a steady amount of players on both sides, Landroval has had it in the past year in my experience. YMMV depending on your own server.
Originally Posted by ActionBleepstard
Also, there's a great sale going on that if you purchase the upcoming Helm's Deep expansion pack, you can buy all the previous expansion packs at a substantial discount. It may be worth checking out, but you can only access that sale at the Helm's Deep checkout cart.
And most of all, welcome back to LOTRO! Hope you enjoy your time here. Any other questions, please let me know and if you're on Landroval, let me know so I can send you a welcome back present.
Edit: You can log onto your Turbine account here https://myaccount.turbine.com/index.php to find out exactly what expansions you have purchased. Also, in regards to your comment about the moors, yes the population can flux from side to side depending on the night of the week and metagame.
[COLOR=Lime][SIZE=1]other favorite middle-earth related games: The One Ring RPG, published by Cubicle 7; LotR: The Card Game, published by FFG[/SIZE][/COLOR]