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Is this doctrine as deadly as it sounds, 2pts per troop, hit and wound anything on 3+, cept for MC?
It's official! The all Tabasco sauce diet is still the number one weight loss diet for the 4th consecutive year!
Judjing by the IG codex I have here, it's not quite as good as you describe. First off, it's more expensive than just 2pts per unit. Second, it only affects the to-hit roll (and only in close combat). Third, it doesn't simply affect everything (except for MCs); you have to choose a specific alien race.
Overall, given the average WS of a Guardsman it might not be too bad, but you'll be specialising your army. The rules state that one should even go so far as representing this specialisation on models by adding various relevant trophies. It also makes it very clear that one should not change the specialisation for each game you play.
Why do the survivors remain anonymous -- as if cursed -- while the dead are revered? Why do we cling to what we lose while we ignore what we still hold?
Name none of the fallen, for they stood in our place, and stand there still in each moment of our lives.
--Duiker, "Deadhouse Gates"