It certainly includes big robots as a plot point, but that's really just a backdrop for the character drama and deeper (and pretty heavy at times) emotional themes of the story. Things get very avant-garde towards the end, and the studio producing the series basically ran out of money to animate the last few episodes so you'll have to jump between the movie adaptations if you want a complete experience. I'd still probably recommend at least giving it a try sometime, as it's personally one of my favorite anime series and a landmark work in the medium as a whole.