Satisfying, Though could be better.
You get the choice of picking between 3 classes, each with two sub-classes in it, there are gun wielders, meelee attackers, and magic users.
I picked the Engineer class, a sub class of the hunter class (Guns, basically), the engineer has variety of guns, and the ability to construct drones, which are mainly robots that fly around and help you in some way or another.
So after I designed my character to fit my taste (and an accidental purple hair :S) I was thrown into the streets of London, with barely a tutorial, inexperienced and poor, to fight hordes of (dumb, yet..) horrifying zombies with dual guns.
So now, after a quick walk in the ruined streets of London, let the butchering begin, because Hellgate: London focuses mostly on kicking bums, because, no sir, thinking and riddles isn't on the menu of Hellgate.
I found myself comparing Hellgate to another RPG I used to play, Dungeon Siege (maybe because I didn't play Diablo,but most people are comparing it to Diablo) it's basically a one man army running through hordes of monsters, with a bit of side quests, special items, and upgrading yourself from time to time (you're able to mod your items and upgrade them with the necessary parts).
Well, the only things I find annoying in Hellgate is the difficulty (and some major physics bugs if you're playing the single player), because you might find yourself dying once a day playing through the higher levels, or maybe it's just me? but heck, though you'll die, and even if you fail, and if you sell the wrong weapon, or mod the wrong weapon, even if you'll make a huge judgment mistake and pick wrong skill, you'll stay addicted.