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Ever since we've been able to use a grenade AND tactical insertion, I've been using it

And I love it.
Tacs are very useful. When rushing, you can just put one near the enemy spawn.
Also, they give second chances in the right situations. Suppose you see a few enemies around a corner on your minimap. Plant your tac at the corner, then jump out and spray at them. If you get killed, just spawn fast and jump out at them again (without putting your tac down). They will NOT expect it, and you will probably not get killed.
If you're a prestiger, I highly suggest unlocking the tactical insertion early, so you always have it through future prestiges.