One thing is clear,
Hack programmes are always available at some cost to the user, unfortunate for those of us who wish to have a good and fair game, more recently in BF2 the teleport hack was frequently used though not for long, and we have seen the new knife hack also,
MoH Tier 1 has been rife with hacks the first few weeks, and you could see PB rolling over the names while banning these players, sadly many get by PB and most every game suffers from hack programmes. As has been said, we simply have to grin and bear it.
This problem Is something that all involved are constantly working on to improve the situation, though some Aimbots for instance do get through, they are short lived, but it isnt long before another bot is introduced to the mix.
I would ask you all to remember, to fix a leaking roof, you first have to find where the water is getting in!!! in short, the problem has to occur before it can be fixed, and it is usually fixed in short order thankfully, BUT, if someone comes along in the middle of the night and puts a few more holes in your roof, you have to start again my friends.
I am pretty sure that all the while these problems happen, all that can be done will be done to ease this problem, also, a lot depends on the server you favour, and how capable and fair the Admin are, so please have patience my friends.
Im sure Crysis 2 will be a clear winner

Guss