Is Kinetic Melee the lowest in terms of ST DPS? Generally, yes. Though only dead last on Brutes it seems, with second to last for Tankers.
However, the difference between Tanker's top ST DPS and Kinetic Melee is roughly 90 seconds, going by @Ston's DPS charts. So, imo, the difference just gets blown out of proportion.
I would personally like to see some real work done on Focused Burst to help it's ST DPS. This attack is so nice looking, and it's such a shame that it's better to take an Epic Blast. This attack needs to be reworked into snipe/gloom level imo, so people will want to take it instead.
Sadly for Tanker's Concentrated Strike doesn't reset Power Siphon, so right now, I'm not so sure it's worth taking on Tankers. I only use the attack once on my Scrapper, as a chance to reset Power Siphon. If it doesn't do it, I don't use it again until the next Power Siphon window. Sadly, it's chance to trigger PS reset seems to be low.
If you want the best out of Kinetic Melee, go Bio Armor for sure. That armor set is going to make EVERYTHING Melee Set nice, in terms of damage 🙂