Most 360/PS3 players, have never heard of BG. As for the console version of DA:O, that's what happens when a game is made for PC first, consoles second.
AP will sell a mil easy, it's on three platforms. One of which is starved for RPGs. Unless of course it's recieved badly by the press, even then Kane & Lynch still did well.
None of them hit 2 mil so quickly. Companies like their new games to sell quickly at full price. Not over ten years at reduced prices.
Fable 2 is considerd a big success at 2.6 mil, as is AC at 2.2.(360). If AP reaches 2 mil on one platform, it will be a blockbuster. Also as a fun note, Grand Theft Auto IV sold 2.6mil on the PS3, MG4 3 mil. Halo/Sims/WoW are not a measuring sticks, they are anomalies.