No where near what it could have been.
To start, there are a few glaring bugs still left in the game, a primary one being mobs that get frozen in place. This was especially annoying while fighting a legendary creature, hoping for good loot drop, and having the enemy lock in place with only a small tick of life left. The mobs that freeze cannot damage you, or be damaged. Wierd thing is, eventually the mobs start moving again, to some extent, but still cannot be damaged.
I also noticed a few optimization issues. I have 2gb of ram, an AMD Athlon 64 3500+, and a Radeon X850XT, I had dynamic lighting turned off, and all other options on "high" settings. I could run around heavily populated areas (populated with enemies), fires and lights all around, and get no slowdown, and then after lengthy playtimes, the game would start to turn into a slideshow until I would port out of an instance, and back in.
With all of that out of the way, I wish there was something good I could say about the gameplay, other than it's extremely easy. I remember a lot of the fanboys on forums telling people NOT to judge the game by the demo, and not to even judge the tutorial levels by the demo, because it was a very old build.
THIS IS ENTIRELY UNTRUE. WHAT YOU SEE IN THE DEMO, IS EXACTLY WHAT YOU WILL EXPERIENCE DURING THE FIRST PORTION OF THE GAME. The difficulty, the missions, it's all exact. The only difference being that when (in the demo) you are sent to Covent Garden Approach, you enter a tunnel instead of the open (and blocked off) area you end up in within the demo (and therefore continue on with the game).
Enemies barely damaged me, except a boss that I faced after going through a portal to hell (looks like portal out of Oblivion). Playing as a marksman, I went through every instance so far with barely a scratch, got more loot than I could shake a stick at, and became incredibly bored with the game.
The graphics and atmosphere look pretty good, monster designs aren't bad at all. sound design is pretty decent as well, but unfortunately that is about all the game has going for it.
Also, the world does not feel connected. It's not open, you end up in hubs, that have portals to "killing zones". Once you finish certain missions in those areas, another portal will be "unlocked", allowing you to move on to the next hub. It really disconnects the player from the world, making the world just seem like a collection of levels thrown together, accessable by a hub, with no real feeling of it being a full world.
Also, even though the graphics are detailed and pretty decent, you will continue to see the same textures and models constantly. Underground Tunnels, hell (which looks like areas out of Clive Barker's Undying), and destroyed London cityscape. That's pretty much it, at least for the first 4 hubs of the game that you will reach. This makes the game feel even more repetitive than it already is.
After playing this game, I really had to rethink my review of Tabula Rasa. NPC's in Tabula Rasa take cover, reinforcements beam down (Friendly and enemy), the world feels more dynamic and open. And even with a seeming lack of content in Tabula Rasa at launch, compared to Hellgate London, TR is an amazingly deeper game, with more variety, more dynamic interaction, and a much better story. Truthfully though, Hellgate is not an MMORPG, but they are offering a subscription fee that is close to a standard MMORPG fee. I would much rather pay the fee for Tabula Rasa than for Hellgate: London, because they really can't do much (in my opinion) to expand Hellgate enough to change the game up. Throwing in more text asking you to kill 10 of "X Mob" isn't going to cut it as extra content, and the world is not alive enough, nor is the game requiring servers heavy enough to require a fee. My Advice: Stay far away from Hellgate London, unless you really want a breeze of an "FPS Style" RPG to play online (it is playable in 3rd person also). If you actually want story, depth, or challenge to your game, avoid this like the plague. For sure, avoid the fee, because there is absolutely no way that this game is worth any type of subscription model. The subscription model for this game has to be one of the biggest scams I've seen so far, and I'm not even a huge fan of paying 15 dollar a month fees for the MMO's that I play.