If you enjoyed the first one and had your socks blown off by the second one then i believe you will LOVE ME3 all the way up to the last few minutes of the game. But that's just from my own personal experience mind you. So yea i say buy it and "Finish" the trilogy...
I've played ME3 twice and enjoyed both playthroughs (save for the last 10 mins) though ):GoGoFrenzy said:No. Just buy it used and play it on your Xbox. Even better would be to just rent ME 3 because I assure you you will NOT be replaying Mass Effect 3 like you did Mass Effect 2. I have yet to meet one person who replayed ME3 after suffering through the trash ending. Not worth paying full price for that disappointment.
**By the way there's more wrong with it than just the ending. I had plot errors/inconsistencies with decisions made in my previous game. Really frustrating ones like Liara acting like the Shadow Broker run with my Shep never happened.**
Anyway, you sure as heck don't want Origin in your pc. Also, you will turn blue in the face and keel over dead if you hold your breath for a ME 3 sale on Origin.
Mass Effect 2 was the best game of all three.
If you want to see how much a slap in the face ME 3 is I suggest going over to the Bioware forums and hear it from the fanatics that live and breathe Mass Effect. There is even a non spoiler section.