I currently have a Dshark engie and as i mentioned before, it depends what you are messuring your DD against, the shark certainly wins out across inf mish's and trash mobs in raids, they got low def and die fast so the FA and burst is where your dmg is comming from, however, it kinda sucks against anything with a pulse.
Where you dont cap those lovely 15k FA's anymore and in some cases your FA fails completely.
It fun to out tank soldiers in your research grinding inf mish's, but thats about it, in terms of a DD set up it falls short to most of the other alternatives.
It's also a pain in the ars to keep it from OE if you dont have a full auto contract from your orgs towers.