I've ran Spellplague today, with 2 TR's, a GF and a CW. My feats/passive aren't optimal and I'm at 11K gearscore. I must say, it is a lot more fun. The GF actually has a role now and it's not just mindlessly standing in the circles. We didn't have any problems, ran it at about the same speed as before.
I got a DC, was pretty easy to play until the Mad Dragon dungeon. Only receiving 60% heal and getting tons of aggro from adds make it very annoying/hard to survive. And once the healer falls, the team's dead as well. So wouldn't say it's as easy as it looks ( only level 32, dunno how it is at 60 )