Which to Play First? BioShock 2 vs. Mass Effect 2

I'm outraged to hear Mass Effect 2 is far superior to the original, having chosen to play BS2 first vs. ME2 (the other people in my house having chosen ME2 first). So far BS2 is NOT better than the original - but I hear through the grapevine its a slow first 10 hours and then 'its on' in the last 3 hours, story wise. Not that I'm not TOTALLY LOVING it (halfway through Pauper's Drop) but I can't say it's a vast improvement on the last one.