Mad Max struggles just to survive, heroism is always a side-effect of that.
Whereas James Bond is a hero, but his job requires him to do decidedly unheroic things sometimes.
Both movies look good, but Spectre looks better. Not because of production values (though they obviously spent a LOT of money), but because Fury Road is way too heavy into the CGI. And it looks fake.
When did practical effects become taboo? They bring a viscerality to a film, which is why gritty, low-budget horror movies are so frightening. And Mad Max needs that visceral, grimy feel, not the plastic Uncanny Valley impression CGI effects give.