Never played any Mass Effect game myself, so bought this pre-owned with the intention of going through this and ME2 in anticipation of ME3 next year. I read (and trusted) the reviews of the majority.
My verdict? Pretty pants tbh. The graphics are pretty good considering it's 4 years old now, but the gameplay is far from what I'd hoped for. I wanted freedom, of which there's very little. It feels like an expansive and immersive free-roam environment after an hour or so, but 3 or 4 hours later you realise it's as scripted as your favorite FPS. Oblivion/Fallout it ain't, by a long shot.
Other frustrations? How about realising the character you created is terrible 10 hours in? More and more quests get left open because they're infested with seemingly invulnerable troopers with Energizer Bunny shields. How about having to spoonfeed your squadmates because they can't tie their own shoe laces. There's more.
Massivly dissappointing, and I won't be buying 2 or 3 :-(