Ok, I will clarify, if I cannot leave the base, I am blowing up the barricade.
if it is a sentry/turret I will not destroy it. These will save your life often.
If a tunnel is barricaded and I want to use the tunnel to attack the enemy... I will blow the barricade up.
If I see sandbags and stairs in the middle of a field I ingore it, not worth my time. (Also these can be used to your advantage later)
I take base walls seriously... because of artillery, snipers, and veseroids. Do not destroy the walls.