It's a point and click RPG, yet it is still decent.
Gameplay: You basically point and click to move/shoot at enemies, which can be annoying at times. As you defeat enemies parts drop on the ground which act as the currency in the game. (Press z to grab all parts on screen) You can then upgrade your defenses and your current gun, although upgrading your gun isn't a great idea early on when you'll be constantly picking up new ones. You also get a companion robot, HR-V called "Harvey", who can help you.
Your action bar at the bottom is filled with moves that do extra ranged damage to enemies, use your sword ability, throw grenades, etc. You also have 2 "spec" lines called Combat and Engineering. Combat increases your damage with guns and self abilities while engineering increases HR-V's damage as well as grenades and bots. Every time you complete a certain mission, you get 2 talent points to allocate.
After awhile, you'll come across biotic human parts, which you can implant into yourself. They provide buffs, but if your humanity is less than 90% you won't be able to use a certain talent in each tree. In my opinion, I just implanted everything especially since the buffs are really nice. (2 sec. extra immunity with the biotic spine)
One downside is that you don't really get to make many choices in the game. So you're just Seth Walker going about the ship defeating the missions. And about that. You're only on the ship for the whole duration. The scenery of the ship is good, but it's the same atmosphere.
Graphics: Good. Nothing super special, but it's basically impressive.
It didn't take that long for me to beat this game. Just a few days of pretty dedicated play although you could do it again playing as the other talent spec.