I completed my first run through of Mass effect today so thought I'd sum up my experience here.
I have to say overall it was a very decent experience. The graphics of the game are very good throughout, especially so in cut scenes as well as the effects of techs and when your shield regenerates etc. They help to create a good game atmosphere.
As already mentioned the non story line planets are unpopulated and sparse, probably as a lot are in real life but it didnt make for an exciting experience. Definitely a minus point of the game are the 'collecting elements/writings/tags/emblems quests'. At one point I was quite jaded and bored by them but I came back and persevered to do them. You could skip them and play through the main quest a few times to get your EXP up.
I really liked the storyline, it progressed quite rapidly and became satisfyingly epic as you drew towards the end point of the game. I liked some of the choices you have to make at a few key points towads the end of the game as they were quite dramatic on 'your' story line so I look forward to seeing what happens in the other choices.
It seems to me that since the game is part of a trilogy and is regarded as on the short side without the side quests (you can avoid them but I didnt think they were that bad! - the collecting things tasks are the main culprits of boredom!) that anyone should grab this title when its cheap (12.98 aint bad!) and just enjoy the story and experience.
I may well play through again to do some of the achievements I havent done and to explore the renegade side of things which I dabbled with when I became full paragon (lots of shooting people in the head seemed to ensue!). Overall I think it was a 9/10 experience for me.
I might post some non spoiler screenies here or on the screenshots thread at some point.