Oh man, I better not waste time on side missions then.
Let me put it this way, I know nobody who likes the ending, absolutely nobody. It's not a "well it could be better" ending, it's just plain out horrible and people are literally asking and willing to pay more money if they would release DLC endings that are good to make up for the crap they have in the game now.
My suggestion? Honestly? Play the game up until the final "point of no return" (won't spoil it or when it is) and then stop, never play the ending, and just make up one that suits you.
Do the side quests if you want, there's some really cool stuff in the game - just don't play the ending, you will feel cheated and regret even putting time into the game.