To be honest it doesn't bother me, don't play and have never played the game to "catch them all" but I can understand why those that do would be upset.
And as much as I loved mega evolutions, there were a few pokes that shouldnt have got one and just got regular evolutions instead (Pinsir, Mawile etc.) and I never really cared for z-moves.
Also as people have mentioned, B&Ws lack of being able to catch them all, didn't remove my enjoyment of those games.