No they are not. Dps is lower and their clip is smaller. OE has slightly faster reload, a bigger clip and full auto, therefore it dish out more dps. It's simple.

Full auto is irrelevant. Messenger > timepiece > oversoul. Messenger just hits far harder. It has more total damage per clip than either of the other two. One burse of messenger is worth about 3 bursts of the others.

Can someone tell this guy that he is wrong?

I could say the same to you. I have extensively used the timepiece (it was my favorite weapon) and know first hand it doesnt compare to the messenger.

This paragraph says it all: You’ll be reloading frequently, with no buff to how fast you can do this short of using Flared Magwell or Pulse Rifle Reload Gloves. Even with Flared Magwell, now you have not-so-great Stability, and the low Magazine Size of 24 to contend with. The slow RoF is a big enough penalty that even with your relatively hard Impact, you’ll do less DPS than the faster-firing alternatives that you could roll with more PvE-friendly perks. Really, the only way we’d recommend using The Messenger in generic PvE content is with a Solar or Void Adept specialization.