First off in terms of graphics this is amazing, even after 2 years this game can still compare well with new releases. The game is also absolutely huge with tons of sidequests and extra equiptment to buy so is fun for many playthroughs.
One slight issue with this game would be the first 1-2 hours which are poorly explained and little tutorials, and leave you wondering around the citadel lost without clear instructions, but after this the game really comes into its own, the vast areas of space to explore and a epic storyline make this a great game.
One thing i didnt realise when i brought this game was this it only includes bring down the sky dlc, so i had to buy the other at 400MSP. Although for 10 pounds Mass effect is an absolute bargin.