It has been said that the PVP part of the game is imbalanced. Is this true?
-That's a rather ambiguous question. Strictly speaking, it isn't, because everyone has access to the same card pool on both sides. However, I suspect what you meant is whether certain deck archetypes or cards are problems, and in that case I would agree.
If it is true, What exactly is the problem?
-Certain elements are weaker than others, and there is not enough diversity in the card pools of certain elements, wheras others have multiple possibilities. An element like darkness has healing, permanent and creature removal, a good shield, and decent creatures. An element like life has a bunch of creatures, none of which are particularly spectacular beyond Giant Frog, and a bunch of healing, carapace, and that's it. Fire has faster, better creatures than Life, even though Life is supposed to be about fast creatures, and it has permanent and creature removal as well. Those are just a few examples. A larger card pool would help a lot. Certain elements are extremely predictable and/or weak, such as Life, and this makes them poor choices in PVP.
What adjustments are needed in The Arena?
-The arena is at a fairly reasonable level of difficulty versus reward in terms of winning rares, but the electrum/score won is too high. Also, the rewards for posting a good deck in the arena are quite poor; even if you get to the #1 spot and hold it until you drop to 1hp, you only get the electrum of four or five platinum arena wins.
Is there anything that should be added or removed from game environment?
-This is awfully general. I'd say we need more cards, more quests, geared both at newbies and veterans, more PvP events, more reasons to randomly PvP (pvp1, pvp2) as well as a pseudo-random pvp system that paired you against players of similar skill. (which currently cannot exist since pvp1/2 is pretty much empty) I could list a lot more, but those are pretty big ones.
What is the one thing about the game that is most enjoyable?
-It never seems to get old. I've got over 10k games played, and I'm still here. I don't play as much as I did when I started, but it's still a fun diversion.