Zor (lead dungeon/raid guy at Trion) just posted a "state of dungeons" post a few days ago...lemme see if I can find it...brb...
Ahhh, yes. Here it is.
I bring it up only because it offers some insight into the way the devs are thinking in terms of PvE balance and tuning right now, and I can tell you without hesitation that T1 dungeons are like a WoW heroic, T2 can be like a 5-man raid in terms of actually having to wipe repeatedly on bosses until you get a working strategy in place. They're frequently tuned to have an extremely low margin for error. (A single mis-step on the fourth boss in expert Runic Descent will result in a dead character.) My tank character is geared for T2 now but the last couple of runs I've tried have ended in disappointment because the healing and damage we needed in order to be successful just wasn't there. Overall, I'd say the content is tuned so that if you enjoy a challenge, you'll find it. And three months from now the forums will be flooded with people screaming for nerfs. :P
Expert rifts are fun. And the nice thing about them is that even though they're tuned to be manageable by a group of 5 characters with appropriate builds and gear, you can bring as many people as you can stuff into a raid group and just have fun with them. Start to finish, assuming no wipes, it takes 10-15 minutes to do an expert rift. Maybe a little more.
Raid rifts are fun as well. I was part of the raid that got the shard first death rift clear a few weeks or so ago and we tried the water rift raid but we didn't quite have the gear for it. There's always a timer ticking with rift raids, which adds to the tension (and thus the fun). If there's not an explicit timer for the stage you're on, there's still a collapse timer on the rift itself (usually 10-15 mins/stage, give or take). If you haven't cleared the stage by the time it expires, the rift closes. If you do complete the stage, more time is added.
PvP is...similar to WoW, but different enough to be interesting. Keep in mind I play on a PvE shard. I do have a rogue that just hit 50 a couple of days ago with enough favor already banked to buy all of my rank 2 and 3 PvP gear. Two of the four warfronts in Rift are extremely reminiscent of WoW BGs (The Codex -> Arathi Basin, Whitefall Steppes -> Warsong Gulch.) But then you have Black Garden (which, if you're not high enough level yet to have seen Codex/Whitefall, you've most certainly had a chance to see Black Garden.) I like it. Small maps make for some great PvP chaos. And then there's Port Scion which is a bit like Alterac Valley only not. There are PvE objectives (bosses to kill, faction NPCs running around, etc.) but it's a very neat map. I'd say that overall it's a little smaller than the map for Codex, but the way it's laid out is neat.
There are still some glaring balance issues in group PvP right now. If you play a warrior or a cleric you're doing fairly well. If you're playing a rogue, you're feeling a little mediocre. Mages right now just raise an eyebrow and kill armies.
Dailies are also a bit more interesting than I remember from WoW. You can go do dailies for one faction one day and when you go back the next day, they're all different. I know for sure that there are two full sets of dailies in Iron Pine Peaks for Icewatch notoriety, and there are 2-3 sets for Order of Mathos notoriety in Stillmoor.
Overall, rifts and invasions can get repetitive, but I'm not too concerned about it. They're still fun in the chaos/mayhem department. One of the things the devs have commented a lot about is the way they've set up their tools to enable them to add new content and new events (ie. rifts, zone events, etc.) very quickly. What we see now is just the beginning.
I've been to Greenscale's Blight a couple of times. The first time I was by myself bombing around doing my dailies in Stillmoor and was right next to the entrance so I peeked in. Neat place. I went back with the same group I was with for the death rift raid, but we were 8 people in a 20-man raid (before Trion buffed the **** out of the trash :P). We still manged to clear to the first boss. Tons of potential. I'm looking forward to going in "for real" and progressing.
One little thing I've noticed, however, is that the lore is very present in the game. I'm not sure which faction you play, but I play as Defiant. If you go to Meridian as a Defiant and port/run up to the top of the tower where The Faceless Man hangs out, you'll meet two NPCs; Uriel Chuluum and...ugh...I don't remember the name of the other one. You meet them again in Stonefield and in subsequent zones all the way up to Stillmoor where a story unfolds that is really quite cool. There's another NPC that you meet in Scarlet Gorge that you then come across at various points and there's a story that unfolds around her, too. Really, really cool stuff if that's your kind of thing. Every zone has a story that is relevant to the zone itself and the world at large. And then there are the epic Saga quest lines that take you all the way from your starting area through each zone to Greenscale's Blight.
There's a reason Rift has 1.3 million players and there's a reason I expect Trion to keep most of them and add more as time goes on. They just did a great job with the game and set themselves up to continue doing so.