After finishing ME 1 & 2 in my marathon, I'm afraid to turn on ME 3 again.
Basically, my peeve with most morality systems is the fact that they tend to be strictly binary. ME isnt THAT bad in this regard, but where it truly manages to niggle me to death, is the stupid charm/intimidate mechanic.
For those of you who are unaware:
ME 1 had Charm and intimidate as skills. You just needed to level them and in certain conversations, they gave access to a new talk option that would usually result in a better outcome to the current situation.
Since that gulped down a TON of Levels, they changed it in ME 2. This time it was based around your Paragon / Renegade (Jesus / Satan) metre. The charm / intimidate options basically weighted the amount of points you had versus the amount you potentially could have gathered at that point. Some of the dialog options had low requirements, like 40-60 %, others had up to 80 %. It made me really paranoid to get all the Paragon choices, because I was afraid I could miss out on some important dilagoue later. But at least I could allways keep track and feel relatively safe as long as I stayed strictly Paragon.
ME3 takes it to the limit, with having reputation requirements for a lot of dialogue options AND adding timed missions. So I'm stuck in this constant loop of being afraid that a mission could expire / fail, and worrying about not having enough reputation to unlock those conversation options. I can barely play 5 minutes without swapping to a guide Online and double checking if I take a critical mission way too early.