One example how the Deceptor actually works. Without judgment on my part, just to show how I use it. I actually start a new campaign, in my 6 man team I have 2 Heavies and one Assault (Strongman) with Deceptors. All on LVL 4, no cross classes, date ingame is mid January.
One of my Heavies in full Anvil 2 heavy armor (-30% acc) vs one Triton 6 tiles away …
The aim …
The result (last enemy, mission ends)…
My 2nd Heavy has PP heavy torso for jetpack, technician helmet and legs, together +7% acc. He can do reliable shots at 8-10 tiles. The Assault has his assault armor and with Strongman +20% acc with the Deceptor and is accordingly a little more precise than my 2nd Heavy with the Tech armor mix.
Actually I like this teamsetup, the pandorans not really. 
Edit:
In this mission, Phase One for NJ, I killed 4 of the 7 enemies with my Deceptor trio.