The strategy is bad as well as the tactics.
For example strategy-wise I heard Obama say on TV "Our aim is to contain the Taliban and prevent them spreading their influence". See, not a word about DEFEATING them.
As for tactics, the Talis don't go in for large-scale pitched battles for the simple reason they don't want one. In CM terms, they hold most of the flags in Afgh and just want to sit tight holding them til the Coalition goes away, years from now.Their attitude is "We're here and we're staying, we don't need to fight"
Sure there are small and ambushes and firefights, but these are just isolated pinprick things in the overall scale of things.
Only last week a TV documentary followed a US battlegroup that was going out to look for a big battle with the Talis, but it went like a damp squib because the Talis simply sprayed the convoy with small-arms fire at long range, then melted back into the hills,valleys and villages. Nobody was hurt on either side.
The Talis know they can't be killed if the Coalition can't see them..