I think that there should be more loot dropped from bosses because when me and my Fireteam killed the Devil Walker during the Strike to kill Septiks we got absolutely nothing! Not even from Septiks himself! I dot know if this was a glitch if it is I hope it gets fixed if not please increase the Boss Loot Drop Rates please.
Technically bosses don't have a guaranteed drop, your reward comes from completing the Strike Mission itself. I do hope their drops get bumped up, however.
Septiks gives u a banner to sell for glimmer and about 25 glimmer for killing it. The devil's walker also gives you glimmer and better accuracy for shooting at the legs for 15 minutes. :)