I recommend picking this game up for any fans of ME1 or ME2, or both.
There won't be a GOTY edition with all of the flak the game received, the fact that ME2 never had one (although the PS3 edition had all the DLC due to no ME1 on PS3). and they have only had 1 true DLC pack (Leviathan), whereas the Prothean DLC was included in the CE versions and unless you want him, isn't required to finish the story out. Even then, ME2 had much heartier DLC and ME3 is batting slow up to the plate. They have released a number of FREE dlc for multiplayer though.
The mutliplayer is actually impressive and similar to Gears and a military horde mode for a number of rounds. It helps boost your campaign readiness rating, although I have beaten the game with 60% readiness and made it just fine.
Again- for 15 bucks or less, this game is a steal. It won't be long before any DLC goes on sale for this anyways, pick it up when its half-priced and you are set.