First of all, this is a whole new game. Treat it as such. Get RO1 out of your system.
If you're still too stubborn to get RO1 out of your shnoozle, then don't play this game. Period!
For those open minded players, keep on reading!
Here's my opinion for those who are looking to play this game.
-Decent character design
-Diversified Classes and Subclasses(you'll see once you've played it)
-Interesting In-game features/events( Dungeons, Raids, Rankings, Honing, Pet summons etc.)
-Costume availability (you can look different and be different)
-Stale and repetitive quests (too much kill a number of these, gather a number of that, talk to this blah blah)
-Boring (when played alone)
-Not much diversity in builds( stats are based on your equips in master level/ same equips = same stats)
-Some skills in some professions are not worth getting causing a generic build in skills
I recommend playing this game with friends. It's really boring to play alone after you've reached master level(based on my experience). Don't get me wrong, I had fun playing this alone, up to a certain point. The storyline is good IMO, the characters are quite lovable, and the graphics are not that bad either. I suggest you give this game a try. Altogether I'll give this game 7/10.