I always liked ME1 the best. I never understood why people liked ME2 or ME3 so much. ME3 had a pretty horrible story. Good story telling, but horrible story. ME3 was a massive disappointment. You play the last two games trying to get allies and you get a magic space gun to solve all your problems. (not really a spoiler since it is found like the first mission in the game.) ME1 has a pretty good story. It focused on showing you the world of Mass Effect and made you a part of a military force as well as a government agent with no restraints. It gave a large insight into how the ME universe worked and how the government worked. ME1 was more open world and has more dialogue options then the other games. The story was about a rouge specter and gave you the back story of the protheans and the geth. The reapers were more of a end game thing, which was interesting. Once you get in ME2 you are forced into a terrorist organization, and you can't decline and rejoin the military. ME2 tosses away the older parts of the world and focuses on collectors, which are pretty obviously reaper stuff. You go around fighting space bugs and space gangs, and it doesn't show off the world nearly as much as it did in ME1. ME3 was horrible. There is so much wrong with ME3 I can hardly even begin. You start in like the HQ of the most important people on the entire planet, which is for some reason in a skyscraper and not a bunker. Take note you blew up a entire solar system, and you are hanging out with the people who thought you were crazy for doing so instead of on trial or in jail. So reapers attack and somehow get to the moon before anyone sees them. Apparently telescopes and satellites don't exist in the future. Then Shepard is traumatized by some kid getting blown up, when he/she could of have seen their friends die, their entire crew dissolved into a DNA mess, multiple horrible Cerberus projects, a mind controlling plant thing, and so much more. A kid getting blown up should do literally nothing to someone like Shepard. Most of the game is bad honestly, so I could keep going for the entire plot. I just mentioned the first few starting areas.