I don't know the specifics of the DRM attached because I've only really played Mass Effect 3 via origin, but the client itself is complete trash.
The somewhat recent update is the cause of it all. It underwent a major revision in style and whatnot. Version 10 I think was the number. Since that update I was getting constant friends list problems (not rendering, constant spinning circle, telling me online people are off and offline people are on), problems with games "not in your library" when connecting to friends games, and general "it runs like shit" problems.
An example of the last bit: I had fraps running to tweak some game or another. I went into origin to talk to someone and noticed that fraps seemed to think that Origin was a game that should have its FPS measured.
The act of typing lowered the framerate to 40 FPS.
The. Act. Of. Typing.
Typing.
Into a chatbox.
40 FPS.
Granted I'm running a shitty laptop with a lowly i3 and 4 gigs of ram, but still, this is supposed to be something that runs in the background not taking up a lot of resources.....
It will probably be a long while before I purchase an Origin only game.