Because everything they have put out since Lair of the Shadow Broker has been rubbish. Rubbish they have stood behind with their fingers in their ears going "lalalalala".
DLC antics aside, ME3 could buck their current trend of pap, but I wouldn't bet 35-55 squids on it.
Would agree though, they've not had a very good track record recently. Dragon Age II was largely hated upon.
We'll see if they've turned this around with ME3, I'm willing to take the hit for £35 to find out, least then if its pap I've put my money where my mouth is and I'll be entitled to complain..!!