Greetings for a former UD player!

So you want some feedback? Ok, let's see... the game itself is simple (you only have to see the graphics) but addictive (to me it became almost as WoW), much more funny if you interact with other players.

You start as a survivor (or zombie -zed-, if you preffer), being asked to select a class (fireman, policeman, civil, doctor or whatever). That profession determines your initial stuff and skills, but later in the game it becomes irrelevant, as all characters can have the same attributes and equip. If you want to level-up quickly, I suggest to choose the firefighter.
Each day, you have 50 action points (AP) to spend, which you can use for several actions, be attacking an enemy or looting a mall, tunning a radio frequency, or barricade a building for made it safer, or even spray a wall, etc. As any other RPG, some of this actions grants your PC experience points which you can use for buying new skills.
After you've spent all your AP, you are too tired to continue and have to wait for a while (IIRC, AP regeneration is 1/half-four), and have a nap -so, if you're not a zed, stay inside a safe house before you lose all your AP!

The interface is quite intuitive, lying in a few buttons and a map. With then you can move (any direction), attack, use items or whatever. Easy, isn't it?
If you click on a player's name you can see a description (appearance and the like) of the PC, level, XP and times died. If it is yours, you can change the desc of your PC (both for human and zed) and set skills, in case you have leveled.

I have said the game is more fun when interacting with other players. In fact, I find it soon turns a lot more cooperative than most comercial MMORPG, where you can (more or less) solo most the game until reaching the most dangerous places (ie., high-instante dungeons and the like). Cooperative game in Urban Dead is mandatory if you want to survive (be either zeds or hunters) for a long.

I suggest to play a few days to learn how to interact with the interface and the game itself and later, if you find it enjoyable, join a group of survivor and/or zeds and get fun in multiplayer mode.
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Then start meta-gaming, using forum reports, maybe writing a fictional diary of your character progress and feelings, and so on.

On the bad side, the game becomes a bit boring after a time due the own limitations of it. When you have reach the maximun level, it would have became just more and more repetitive -search for shells, kill some zeds, barricade the building and report, search for shells and start again. From time to time, a new (tiny) update come to bring some joy to the game; they're definitly not kick-ass bring ups, but can really save you from a bored day.
And finally, but not being fault of the game itself, there are as usually "player-killers" (PKs) that can give you some headaches (humans killing other humans can be really annoying).

For those using Firefart... I mean, Firefox, I recommend to install Urban Dead Toolbar, a nice addon for the game. Using just XML+CSS, I asked some developers for doing something similar for Opera (maybe as a cool widget which would load UD in its own window), but unluckly the proyect was never started, AFAIK.

I retired from the game a few months ago, but nevertheless if you have any question just ask and I'll try to answer.