no, thats what tacticals should be. They already completed their training as assault marines and devastators before being promoted to tacticals. Tacticals should be the in-between the two. You dont have the jump packs for the melee equipped marines, but they can act as a screen for your marksmen/gunners in your squad when you combat squad them.
the reasons why tacticals are complete shit (outside of only having 1A and 1W) is the fact that they cant take anything worth taking, because anything worth taking is worth taking in 4's.
I would also change Devastators to allow the entire squad (except the Sgt) to take up to 9 heavy/special weapons. And I would make assault marines have 2 attacks base, and allow them to take up to 4 special weapons/plasma pistols.