HereForTheBeer: No. Their job is not to damage, but to paralyze. Because of this, they require a bit of babysitting else they'll simply keep attacking the same unit over and over again instead of moving on to another target to paralyze. Once knocked out in this manner, the target is easy pickin's for your damage-dealing units.
icexuick: Try and play some Balanced Annihilation. Hence the name, it IS practically TA, with all the beautiful units, but better gameplay. And the spiders now come in 2 sizes - the paralyzing one, and a bigger brother with rockets.
Check out
https://balancedannihilation.com/. It's free as long as you have TA, when reading this here, i think you already have a copy!
Thanks for the heads-up.