True that the proc may not affect everything, like the items mentioned above are not affected by a shield stripping proc that Tetryons have.
That's just their proc. Otherwise they do as much damage as all the other energy weapons. Get Tetryons that have the same crits (CrtD) as Antiprotons and you'll have the equivalent weapon but with an proc as well.
Antiprotons have an inherent +20 crit severity mod, while Tetryons get a 2.5% shield stripping proc. As a result, AP weapons will always enjoy a +20 crit-severity advantage over Tetryon weapons with identical mods / suffixes. When the the target has no shields, tetryon really becomes lack-luster compared to other energy weapon types.