People always forget how bad the first hours to Mass Effect 3 are. It's just as bad as the ending hours, if not worse, in terms of pacing and writing.
The fact that the ending (understandably) got the most criticism by far always frustrated me, since it meant that the game's other flaws (the ME2 characters by necessity being almost afterthoughts or easily replaced, the opening where the plans for the long lost Reaper Off Switch are discovered on Mars within an hour of starting despite BW saying prerelease that we wouldn't be finding something like that, the entire galactic readiness system, the eavesdropping on people to go scan planets and magically teleport an artifact up to your ship sidequests, only beaten by the running around the multiplayer maps sidequests, the fact that every single plot thread had to be wrapped up immediately whether or not it had actually been given the time and writing needed to make it feel natural, the whole "Reaper invasion" setting meaning that nearly every mission that wasn't geth-related was either fighting husks on a rubble planet or Cerberus's unexplained superarmy attacking some kind of tech base, everything about fucking Kai Leng, Javik being paid DLC unless you preordered a special edition) got relatively ignored.
Mass Effect 3 is a game that starts badly, stumbles around until it gets good at the Rannoch and Tuchanka parts (where I still have nitpicky gripes) then immediately slides back into mediocrity and never gets back up until the bad endgame section, which felt much worse because it was supposed to be the emotional ending of this ambitious trilogy we'd been following for years.