iI think mass effectMass Effect 2 (ME) shows you how did sheperd saveSheperd saved the galaxy from collectors and the new cerberus organization.
In game in mass effectMass Effect 3 the cerberus relationship continued in a rough manner, but we came close to the alliance a(a human military organization) in game, just as we arewere in the first game as alliance military operative and we become a spectre in first and third game.
In my own words and analogy, its: It is going to feel like you wake up in the morning and done, do all the stuffyour morning procedure and gottenget ready for work but. But you forgot to take breakfast such as comparable to mass effect(ME 1, secondly its). Then it's your lunch time you, and again, you forget to take lunch such as comparable to mass effect(ME 2 game, thirdly you got to dinner and you suddenly realized that). So you forgot about breakfasthad no breakfast and no lunch ,...then you In the evening, with great hunger and thirst, you finally do the dinner to remove your hunger now remember. Now look at dinner as it is mass effectME 3 game, so this is totally incomplete that you can skip your meal of day time to time. so mass effect trilogy is same as meal which you should play equally all to achieve satisfaction and interest of getting out all three ,.... AllIn my opinion all three games of the series are good and give you great, much fun and exploration oflet you explore ME galaxy through out game sogames. So remember: only playing mass effectME 3 would be like leaving two important meal such as break fastmeals (breakfast and lunch) which would let your hunger explode to know more when ever. Whenever you get chance you should definitely play all three games of themthe sequel.