As a person who likes to consider himself a single player purist, I'll ask you to reconsider that MP. It has much to offer that can't be found in the 40 hour campaign. It fleshes out the Mass Effect universe in indirect ways. Who would have thought that? I've spent close to 300 hours in that MP space and would do so again with no second thoughts.
Jumping in here, but meh. I'm a single player purist too, and I gave the MP 30 hours in vanilla and another 2 or so with every expansion because of how many friends I have who got into it, and for some of us it just doesn't click. It is unfortunate for us but it is what it is. I find it repetitive in much the same way I find virtually all other multiplayer experiences repetitive.
I hope ME4's MP is amazing for everyone who digs ME3's, but I doubt I'll even boot it up unless there are cutscenes, etc of some kind.