I think it's not bad the either way. In fact the not sneaking around actually fastens up the game, atleast for me.
If you want fast gameplay, play L4D instead.
The whole point of Arma is not to be fast-paced but to be realistic.
Basicly removing sneaking from the mod ruined it for me cuz it added a lot of atmosphere to the game. You had to get stuff in order to survive but had to manage the trade-off between need of supplies and the risk of being attacked.
Now most seem to just play the game as a FFA-Deathmatch. Is there even a point in having Zombies atm?