The way I look at it:
If you design a new game that has both single player and multiplayer, then ideally they should both be worth the time and effort, or else you may as well only have one of them.
If you make a series that is single player, and then the multiplayer is added on in a sequel (Assassins Creed Brotherhood+, Dead Space 2, Bishock 2, Mass Effect 3) then the single player should still be the priority. It is a perfectly valid complaint if people are pissed off that multiplayer is added if the single player has any glaring flaws.
Games that are purely multiplayer from the start I cannot see the issue with.
If you design a new game that has both single player and multiplayer, then ideally they should both be worth the time and effort, or else you may as well only have one of them.
If you make a series that is single player, and then the multiplayer is added on in a sequel (Assassins Creed Brotherhood+, Dead Space 2, Bishock 2, Mass Effect 3) then the single player should still be the priority. It is a perfectly valid complaint if people are pissed off that multiplayer is added if the single player has any glaring flaws.
Games that are purely multiplayer from the start I cannot see the issue with.