I forgot about Wildstar. I've only played a bit of it, but I've seen people describe it as WoW-like with a WoW Vanilla level of difficulty.
Wildstar's difficulty has been toned down a bit from when the game launched, or so I've read. The combat is interesting because everything has a visual telegraph--cones, circles, lines--so it starts to hammer in mechanics into the heads of players from the start. The first dungeon is even training for later ones. With dungeon phases like "Don't stand in the red". The difficulty in Wildstar's dungeons is more in-line with the Cata dungeons current difficulty in WoW. You can die if you're not paying attention but the lower level PVE content is the same as WoW's. You can get away with not paying attention to all of the telegraphs for the most part. You can't get away with that in the dungeons and I forget what the group content that weren't dungeons but sort of are were called, but it's also true of those. You have to watch pulls and sort of pay trash mobs a little more respect.
The difficulty in dungeons makes PUG'ing harder because groups can dissolve quickly on wipes. There is a dungeon finder but you're almost better off spamming chat for a pick-up group as a Healer or Tank. There was a large group of GAF players on Exile-side (space hill-billy Alliance), I would join them if they're still active. There were a few questing bottle necks in earlier PVE zones with few gather points and long respawn times made worse by the fact NO ONE GROUPS UP. Seriously, join the GAF guild if it's still active. There's one Exile starter zone that just makes me angry because no one is playing an MMO, everyone is playing an rpg and won't cooperate with each. Swimming around like idiots.
You can switch between DPS/Tank/Healing specs really easily by switching your skill bars, which you can fully customise. I don't think there's a pure DPS class in the game, meaning everything is DPS and Tank or DPS and Heals. You kind of have to maintain two gear sets though but there's only two stats to sort of worry about.
The game had a lot of persistent connection quality issues with lots of server downtime when it went f2p. I expect launch hiccups with an MMO but Wildstar's problems eroded what patience and good will I had. If they've been ironed out, you'll really enjoy what questing content there is before you burn through it all. I can't comment on the end-game but the pvp was seriously unfun, everyone is a damage sponge that takes forever to kill. But then that's what I think of WoW too, I'd rather play HotS than WoW PVP.