ah well...hey really cant ban a game for this reason...it's a fictional situation...and hey, you're killing ppl in any damned war game...as long as it's not tasteless...the No Russian mission was kind of...tasteless...however...i think the london mission could be compared to the washington d.c. missions of MW2...and in that sense it shouldn't be upsetting...yeah, ok, the subway bombings (if there are any in the game) may have upset some ppl...but then MW3 doesn't say that, hell yeah, this is awesome...they're saying that we should be stopping ppl who do such things...
basically, don't ban it. we had the MW2 banned in India too (a while after it hit the shelves of stores however) so i hope that MW3 doesn't suffer the same way...