(yme-loc @ Oct. 22 2007,17:49)
QUOTE
I was aware it only applied to infantry and actually a strict reading of the rather confused -1 to hit rules shows they have nothing to do with cover saves or cover but are given as a result of a model being slightly obscured from view - something that is admittedly taken to occur in virtually all situations when a unit is in cover.
It's referred to more in the section following 1.8.2 Cover to Hit Modifiers.
1.8.3 Infantry Cover SavesCertain terrain is noted as giving infantry a cover save. While in such terrain, the infantry receive the cover save listed on the Terrain table in addition to the -1 to hit modifier for being in cover. The cover save can be used instead of their normal armour save whenever they have to take an armour save. Note that they can use one or the other of these saves against a hit, not both.Since Open Ground is a terrain type that grants a cover save (in a specific instance) it gives that -1 to hit as well... since "in real life" most armies wouldn't be fighting on a flat table surface... well, it might happen in the Eye of Terror on occasion... ?

Why do you see this as so troublesome
yme-loc? ?Most infantry, other than Tau, don't have that great of range or volume of firepower and a static defense, unless garrisoned forward, isn't going to be doing much to snag objectives. ?If someone wants to play "defensively" why shouldn't they be allowed to?
And overwatch fire is only triggered at the end of an opponent's move... I've had canny opponents circle around overwatching formations by jumping from cover to cover, always ending out of line of sight... it certainly doesn't seem like a "game-breaker" tactic to me.