You guys are being a bit too harsh here. In fact, I would say Bioware doesn't get credit for the areas where it did innovate, instead they are just taken for granted.
Yes, we all know they brought their brand of storytelling to the MMO genre, but as a side-effect of they made it so you can define the your character's actual personality and morality in a tangible way beyond just role-playing.
They also brought their companion system from other games, and not just mimicking their existing style from say, dragon age. Instead they tied it into the crafting system and made it much more dynamic. Instead of spending long boring stretches of time in some crafting hall, you do your crafting on the run sending orders to your companions, who's effectiveness are tied to how much they approve of you, which again feeds back into the story. In other MMOs, pets are just another skill that you learn at a trainer, in SWTOR they are people you meet who join you on your journey.
The combat mechanics as they said are where they chose not to rock the boat too much. If they had come up with something radically different, they would've been lambasted from MMO fans who wanted the tradition controls and skills system they were accustomed to and the game would've been considered niche like Fallen Earth. They have however added their own twists like the cover system, which works well once you get the hang of it. Also, TF2 style healing. Even the PVP warzones have new twists on old formulas, like being able to throw the flag in huttball. Or the technical innovations like transitioning into player-specific instances WITHOUT load screens.
There are tons of smaller examples throughout the game, which you may choose not to see or even may dislike, but they are there nonetheless.
Those of you who actually played FPS games before Half-Life will immediately know what he is talking about. Mechanically, HL (which I loved) didn't bring anything new, we had shooting, we had levers, we had in-game cinematics, we had vent crawling, we had all of that. What they did was 1up the presentation and storytelling element to draw you in more, not unlike what Bioware has done.