Ah, but did the artists fail or did the publisher / marketing team not represent their work correctly?
Honestly, I'm always, always disappointed by game endings. Usually the better the game experience, the more let down I am by the finale. There's just never a satisfactory way to bring a great journey to an appropriate resolution in my opinion, because no matter how they frame it, it brings an end to a relationship you've established with the characters in the game world. Considering how invested people are in the Mass Effect universe, I don't think they'll ever create an ending that brings joy to the masses.