That doesn't necessarily mean they can't form an opinion, though. For example, I have no interest in multiplayer because I wouldn't be able to pause the game. and that's completely antithetical to the way I play. I can beat anything in the DA series on Nightmare - so far - as long as I have the magic ability to stop time and think, but I'm awful at action games. (And if multiplayer had pause for some bizarre reason, I would drive everyone nuts stopping play every six seconds.)
I don't see any reason to object to it being in the game, though, as long as it doesn't have an impact on the single player.
Yeah, buuuuuuuuuuuuut, it feels like shaky ground to form an opinion of something you've never tried and simply are imagining about it.
I say this because when I first read the Game Informer article about ME3 and they revealed that there would be an MP element to the game, I freaked the f**k out. MP in my SP series? I was baffled and vaguely horrified. How? How would that possibly work? I pause the game to change my guns or select powers and how could that possibly work in a real-time MP mode??? I was willing to try it, but convinced it was going to be awful, not work, and that I'd hate it.
I formed that opinion before ever having played the game.
And then I tried it.
Do you know where I am now?
I am now someone who has played ME3MP almost every week religiously for the past two years. I started out flopping around horribly, but kept playing, made really good friends, and learned a lot (and have, in turn, helped to teach other players new to MP). I made friends on the ME3MP forums here to such an extent - and enjoyed ME3MP so dang much - that I actually then repurchased the game on two completely different gaming systems (and in one case, even bought a gaming system I'd never owned before to go along with it).
I admit I'm an extreme case, but I can't imagine I'm the only SP fan who traveled a similar path of "this won't work for me" to "OMG, can I get off work now so I can go MP with my buddies again???". 