Honestly, the overall game was good. Cerberus's flip to full evil was explained and my shepherd sacrificed his life to save the galaxy like I wanted but they fucked up the execution of the finale. There should have been 3 choices with options based on your Effective Military Force and Paragon/Renegade score.

First off, change Crucible from a kid with a speech impediment to an VI orb. Shepherd is the key to stopping the Reapers so he is the Crucible. Based on how you played the game...

1. FAILURE OPTION - low of p/r score, low ems:

Anderson dies. Shepherd is told the only way to stop the Reapers is to attempt to have his consciousness uploaded to the Reapers as a virus to overwrite their programming. The attempt fails, Shepherd virus is
deleted and we're given a cut scene of Earth and the resistance being wiped out.

2. 3500-4000 EMF, up to 75% P/R score:

A) Paragon ending. Anderson dies. Shepherd sacrifices himself to control the Reapers, succeeds. Flies the Reapers and Citadel into the sun to end the cycle once and for all. he dies.

B. Renegade. Anderson dies. Shepherd destroys the Citadel, the resulting emp wipes out the Reapers, causes the mass effect relays to self destruct, and kills all life in the Sol system and any solar system that has a relay. He dies.

3. Over 5000 EMS, 75-100% P/R

A. Paragon. Anderson lives. Shepherd takes control of the Reapers and shuts them down allowing the fleets to blow them to fuck. He lives. Happy ending for all.

B. Renegade. Anderson lives. Shepherd takes control of the Reapers and uses them to wipe out all the aliens. Anderson tries to stop him but hold on, The Illusive Man is alive! He kills Anderson, he and shepherd team up to make humanity the dominant life in the galaxy, mirroring the Protheans.