I don't think tactical necessarily is harder than "casual/twitch" shooter. More so considering if you are an older person or someone with slower reflexes/connection which would make CoD by far the harder game.
BF3s playstyle to me is just too boring and slow unless you have a full team to squad up with, IMO of course. --- RIP Gamespot 5/21/09 - 5/8/12. . .