No, definitely not in my opinion.
I played it, when I played it 1st time, I was like "wow, this sure is a great game".
I also thought of paying the premium membership, because of the great benefits and extras.
But after playing a week or so, I hit lvl 43.
The game is same, run there do that, run back, run there again, run back.
And when I hit lvl 43 from lvl 42, I get only 2 quests, yes ONLY 2 quests, then its grinding time..
I got bored of the game now.
I hope this helps you, but don't get crushed by my point of wiev, give the game a chance.
But don't pay for premium at so start, maybe at lvl 40 or 50 or so.