Prime

Low expectations are probably wise, not b/c they are completely warranted here, but as a means to not getting overly excited. Hopefully you're using an import, as I played it out of box and only got about 75-80% of points needed to get "best" ending (got 2, not 3 choices). Just remember, after you make your first decision at games end, you can always go back to the chapter save and endure about 5-10 minutes of stuff to see the others (vs playing a whole other game or repeating from your last manual save). Also, don't wait too long on some missions as they might solve themselves (happened to me at least once).