pretty entertaining game so far. i'm not too crazy about the current party format, nor the lack of a trade screen. it would also be nice if they had more detailed information on their website about the skill gem progression and unique items.
Remember that this is still a very early beta. New functionality is being patched in every week.
The party system is not complete, if you have ideas on how to improve it, then put it in their Suggestions forum. The devs actively read and reply to the forums and implement ideas that are popular.
The trade screen is expected to be in in the next patch, and selling to vendors will come after.
They don't have more information on skill gem progressions and unique items because they are changing pretty much weekly. What they put up today might not be applicable tomorrow.
The game is fun, but it is far from complete. They are still missing a class and several acts, there are areas in the game that you can go into that are incomplete (the church dungeon comes to mind.) Right now the animations for summonable zombies are broken.