The books Crusader and Hades Daughter by Sara Douglass- Warning, spoilers.....ah, who am i kidding, not like any of you are gonna read these books anyway..
The first was essentially pulling off the end of a trilogy much like Mass Effect 3 did: What's that? Big bad's dead? Well, time to kill THE ENTIRE WORLD TO MAKE SURE THAT BIG BADS DON'T APPEAR AGAIN! (God, i wish i was kidding when i typed that.). The rest of the series wasn't super awesome, but i still enjoyed reading it and i had fun..
The second has literally the most UNLIKEABLE GROUP OF PROTAGONISTS I'VE SEEN THIS SIDE OF TWILIGHT. The main character, Brutus, is such an unlikeable ************ even by the rest of the casts standards.
He's an emotionally manipulative douche with a penchant for fucking peoples lives up with Disproportionate retribution (What's that? You're planning on trying to send a few assassins to kill me because i took over your kingdom, raped you and left you to suffer ungodly emotional and physical abuse? Then i'll not only unleash an unholy amount of arcane energy that will brutally murder every person in your city not on my side, BUT i'll also go on to blame you horrifically for this by saying it could have all been avoided if you hadn't tried to kill me because did all those terrible things!) whose also praised to hell and back for doing all these terrible things (Admittedly he's called out ONCE on this and one or two minor characters complain about him, but apart from that...NOTHING!). Now, i understand that this is set in ancient greece and naturally the author went for historical accuracy in regards to characters personalities. So, values dissonance applies. BUT, did i mention that Brutus was also responsible for murdering his own father so he could get power which lead to the destruction of his kingdom? And suddenly, even most ancient Greeks wouldn't wanna support this guy. To the point you wander why, when the very people he screwed over and to whom this exploit is common knowledge to, suddenly want to follow him again when he says he's going to get them a new kingdom...somehow...
Needless to say when you're repeatedly calling for every cast member to die horrifically (One of them PARTICULARLY more then others) you know the series can only really go downhill from here..