I was searching on internet and I concluded that Salarian Infiltrator . it is not better than that of Human or Quarian. The drain of energy is not effective as you are making out. If you upgrade any class to everything that X can be shared and Jack has coveted salarian infiltrator LAWL. It is not different than that of other infiltrator available in the game. the geth engineer in the game also seems to be garbage. If you are having any useful comments on the same then let me know as early as possible.