I actually don't think its enough like either a giant robot show, OR Lok
for what it was, namely a sequel to Avatar: the last airbender aimed at adult fans, I liked Lok, and as minimal as it was I was pleasantly surprised that the creators confirmed Korra and Asami were a couple at endgame
but Voltron legendary defender is just...kind of in this weird gray area of not knowing if it wants to be an Avatar sequel or a Voltron remake
the main issue is fans (Myself included) kind of went into VLDS expecting the LOK team to include a better version of Korrasami in it, which is why we assumed the red and blue coded characters would be a couple
then they weren't, then the team basically laughed at the suggestion that anyone in Voltron land would ever be gay....which made people angry
basically I don't think Nickelodeon were the ones who Stopped DiMartino and Konietzko from making Korrasami canon in the show...I think it was the rest of LOK's writers being too chicken to go through with it that stopped Korrasami from happening, since without them they're writing "everyone is heterosexual: the animated series...with some robots"