Sort of a segway here, but I find it interesting to see how gaming trends come and go. 15-20 years ago, RPGs had minimal open world exploration and primarily featured turn-based combat (see Final Fantasy VII). Today, the term "RPG" seems to include everything under the sun outside of Call of Duty and nothing is turn-based and everything has to have tons of open world exploration.
I played and finished Fallout 3, but didn't put more than a few hours into Mass Effect 3 (I didn't try the first two installments of ME). I stuck with Fallout 3 due to its featuring of some turn-based combat elements - instead of having to do everything on the fly - and because the story was interesting enough. ME3 just struck me as being too big and being too much work to put in. And the controls felt clunkier than a traditional shooter, but still enough of a masher that I constantly had to be on top of the controller.
I don't mean to slam anyone that likes these games, just that it's interesting to see how preferences change over time for a lot of gamers. Personally, my gaming time is limited and my twitch reflexes as a middle-aged gamer aren't what they used to be, so I'd much rather have a gaming experience that delivers a great story and doesn't rely so much on how quickly I can hit the buttons. Give me a 15-20 hour single player experience with a fantastic story (even if it's a story that is "on rails") and that is accessible for players of all skill levels and I'm golden. I never really had much interest in replay value or just wandering for the sake of wandering. To each their own, I guess.