Agree 100%
Although I am more of an Ass guy because I prefer Assaultrons, it's mainly due to the fact this robot is new in the series. The others all felt like more of the same to me, but that's not all, I remember when I first saw the securitron they were new too but they looked absolutely stupid, not in the nice way; then you have assaultron that look as beautiful as deadly while also being new, it was also the first robot to kill me in the game with that laser attack that I really didn't expect. And the first time I heard "dominant species" was during a fight agaisnt an assaultron, one that I had to kill using mininukes. Before I bought the game I decided to take codsworth with me instead of the dog because I wanted to focus on the technological aspects of the game, like hacking, etc. And after I finished the game I was left wanting to have an assaultron with me, not just any, but my own. So you can pretty much be sure I agree completly with your opinion and with your rating on the DLC.
I also think Assaultrons are more comfortable to carry around with you because they don't get stuck everywhere, unlike the sentry bots and their annoying oversized legs.