It's not really a mmo, it's like Guild Wars(first one not 2nd one). Or a better comparison I think, it's very much like a korean F2P game, say Dragon Nest. There's areas where it's "open" where you can see a few players but it's like 12ppl per instance or something so you just see a few people stealing your mobs mmo style, and then you enter an instance for a quest and alone again.
Got to lvl 13 or 14 on a cleric. The combat got better at lvl 10 when I got the divinity stance shit, but overall it's still not great and you end up with a pretty low amount of abilities, which I guess is alright if you had a lot of choice but so far not the case. Hope they do what most mmos do and stack the spells in the early leveling instead of spreading them out, gives more choice earlier to customize your style of play especially in a game with only 5abilities.
However I haven't seen anything interesting when soloing, I saw traps but they were boring "you walk here you take dmg" traps. No puzzles and shit like in DDO, just ultra linear shitty dungeons with just packs of of the same mobs over and over, then a boss fight that has one attack that you have to dodge out of(well that you can dodge out of, if you're a cleric you don't need to dodge shit you just outheal everything, at least at low lvl) and a lot of hp. Rinse repeat, the story isn't interesting either, the unskippable undubbed cutscenes in dungeons get annoying, there is as far as I can tell only one way to progress.
Really the only saving grace I guess is the Foundry thing, adding new content all the time and shit, I haven't checked it out. Sounds interesting but I don't know if it's worth bothering to play.
My final judgement is it basically feels like a F2P korean mmo. Not a shitty one but a decent quality one like Dragon Nest or Vindictus. It's not a mmo by western standards(or even by korean standards when you consider the real big ones like Aion, Tera, Blade&Soul, Archeage etc). But really reminded me of Dragon Nest with much shittier combat but better graphics(not by much though) and character developement.
Might pick it up when it releases since it's F2P, but I'll wait to see if they add a class I actually like, so far I didn't like 3 out of the 4 classes and doubt I'll like the tank. Also fuck them for having a 2char limit on a beta. Or on live. 2 is a really shitty number even though it doesn't cost much to extend it by 2.