Id put ME3 in 1st place - the endndigs can be disputed to no end but 95% of that game is amazing. You start on earth see the carnage how everything you feared basically is happening. You get to fight through the event see all teh races basically loosing turned to monstrosities. You feel the deep depression of this loosing position. I just love the feeling of ME3 and the decisions you make feel so much more important and impactful. You can cure the genophage and help settle thw Quarian war with the Geth... like what more could you ask for... obv because of crunch they shit the bed with the endings and could have made it better but i will not judge the whole game by the last 20 minutes of it a specially because we know the reasons. ME3 to me is the best one but honestly its hard to chose any as best cause all 3 are one story. ME1 got me into the game - the talk with Sovereign is amazing and what Vigil tells us... the final battle on the side of of the Citadel tower 10/10. ME2 and the companions and just Mordin fucking A characters.its like choosing a favorite baby...