this game is definitely worth playing it
i even say its more worth than any other mmo game available, there is a wide-ranging plenitude of things to do
there many nice details and small things to discover
since in russia (where the game originates from) its much more popular and has a much larger playerbase (which obviously generates some good income

) this game have a lot of "care", so there always is new content provided along with balancing and bugfix-updates
there are some negative reviews / forum entries but these are in general made by ppl who are frustrated very fast (means they rant over anything which is not easy achievable)
actually its really fun to play here, i play for over 2 years now, have almost every item and never have spent even 1 cent, so this is what i call real free to play
what you cannot expect is that you level up in 4 days, gear 1 day and onehit every other player, but i think thats self-evident

(negative reviews also often come from this kind of players)