well every time games try to give you a REAL sense of urgency (like majoras mask or pikmin) it always ends up just being a giant annoyance hanging over your experience, a timer looming in the background reminding you to stop having fun and get on with it.
it is of course great that ME3 could make you actually want to hurry up on your own, but really stupid that they left sidequests in the way that they were. of course, it is obvious that most RPG aspects of ME3 are artifacts of what the series was SUPPOSED to be instead of what we got when they decided to ditch drew's plot (and one would argue, ditch their original fanbase). i think ME3 has to be fairly unique in how you look at it, because it is painfully obvious that what we got, while excellent, is not how the trilogy was planned.
this isnt really an issue of standard RPG conventions being incompatible with a more cinematic experience, its an issue of ME3 being incompatible with its original intent. RPG's generally have issues with sidequests feeling superfluous and rather detached from the story, but given the insane sense of urgency thrown at you in ME3, it is almost impossible for anything outside direct and immediate action to the main plot to not feel like, "well, thats another 3.6 million people dead because i was dicking around in a bar".
the plot of the game REALLY does not befit an RPG. it is more befitting a zombie survival game where you get 2 minutes of break before the next slavering horde comes. you really cant have a desperate struggle against the freaking apocalypse alongside a space opera. video games must be paced more like TV shows than movies: take your time building up to the apocalypse, so that when it comes its like, "OH MY GOD SHIT IS GETTING REAL" because it is a significant break from routine, not a 2 minute cutscene followed by "oh i guess the apocalypse is here" like we got. again, ME3 was a great and engaging game, but really, really misplaced. like buying a DVD of the godfather and opening it to find an audio tape of lord of the rings.