I don't like the ending myself, it doesn't change the fact that they have indeed improved upon it. Several major plot holes have been fixed, and one additional ending has been added, by far my favorite one out of the bunch. Considering how many ships it took to tackle down Sovereign alone it was highly likely Reapers would win, Liaras message at the end was a nice touch as well. As for the Reapers origin, one word, Leviathan. During and prior the events of Mass Effect organic life has proven it's ignorance and destructive nature time after time, from Leviathan and Prothean oppression to Rachni, Turian and Geth wars, you can see this phenomena in real life, millenias have passed and nothing has literaly changed thus Reapers decision is logical to say the least.

That's it, nothing on microtransactions, nothing on games I mentioned... ok.