DS is absolutely amazing, but don't bother with Kb+m and plug in a 360 controller. It is infinitely better.
Yes; I am using kbm and the only downside so far is that I wish you could lock the camera rather than have it on an infinite swivel.
A really good point is no on screen HUD or life/health bar. It's just you the guy and his suit. The holographic inventory and map etc. are a very nice touch.
In my opinion this is not a game that you just boot and hope to speed run. It takes a bit of getting used to.
Not bad.....