Ok, I got this last night and I am loving it so far. It's very Diablo like and very fun, at least for me. Some random impressions follow.
Though you have generic weapon types (just like generic swords, axes, etc. in Diablo), you can find big differences between them. They can have increased damage, increased attack (hit probablity), and increase rate of fire (which is quit noticeable, visually and aurally), effectiveness against living being vs. robots, etc. There's another attribute I can't figure out, it says the weapons "pulls enemies". Anyone have any idea what that does?.
In addition, there are some unique variations. For example, my favorite weapon right now is a funky version of the standard plasma gun. What's unique about it - well, the plasma bolts it fires actually track enemies as they move, and if an enemy is killed, the "incoming" bolts move and start tracking another enemy until he is hit and dies and on and on. It's great for taking out mobs, though the bolts move a bit slow. A very interesting weapon to say the least. I just got my first flamethrower so I'm interested in trying that out as soon as I can put some points into it to use it.
The missions are usually either "termination" or "procurement" missions, but you also have missions where you control your character, and also interact and work with one of the other 3 available characters. This is interesting and also serves to flesh out the story.
As noted, there's common storage bin on the ship and if you play multiple games/characters at the same time, you can shift cool equipment between them, which is pretty neat.
I like the skill tree, there are some interesting options there. But you are going to have to put at least 1 point in some options you don't plan to use as they are prerequisites for some of the higher skills on the tree.
Complaints:
1) Manual is crap, just the barest outline, leaves out alot of info that should be there
2) Limited tile sets
3) It's very easy to make mistakes in moving stuff when selling/buying - I've sold/bought some stuff I didn't mean to Sad
4) The animations are weak (but as good as Diablo 2 which was no great shakes at 640x480) (though the environmental effects - fire, light, fog, smoke are very good).
5) My only really big complaint is the save system. You just have one slot per character and you can't just quit - you have to save before quitting. This annoyed me since I wanted to try some upgrades to equipment but I wanted to experiiment before doing so. But I couldn't do this since I had to save before quitting. Maybe I'm missing something, but I dont know why people put in these whacked out save schemes.
Anyway, I'm having a blast - the game is pretty much like the demo, and I loved the demo, YMMV. But if you like the idea of a sci-fi Diablo, the game may be for you.