BioWare's biggest strength has always been in their stories, characters and lore, though. And I dare say they know it very well. (David Gaider said himself that what he thought BW could do best were characters.) Shooting is nice but it wouldn't be a BioWare game if it didn't have something else going on. Multiplayer wasn't even part of BW games until recently. At least not in the traditional sense. In Neverwinter Nights 1 & 2, you could join or open a server to play the official campaign and other modules. It's not what the games became famous for, however. It's not what made BW famous. And I don't think I would be half as obsessed with BW games if they didn't put all that emphasis on world-building, story and characters, either. I have other games that serve well when I just want to spend my time shooting space zombies and the like. But I expect more from BioWare.
Moreover, games are an art form and it's up to their makers what they want to make them into. They can focus on different things. Games can consist of different things. Like making the stories good. Saying games aren't about stories is throwing all the games with great stories that we've already had out of the airlock. I think that BioWare offers something not every company does and that's exactly what makes their games unique, fresh and fun to play. Take away the stories, characters, the colourful worlds and you have yet another generic shooter/dungeon crawler. I can pick among dozens of such titles already.