It should probably be noted that there's much more to Ellison's career than being the guy who squabbled with Roddenberry over a STAR TREK script nearly five decades ago. He's had a long and distinguished career as a writer,critic, and anthologist, producing many award-winning books and short stories and scripts. He's more than just the "City on the Edge of Forever" guy. STAR TREK was just a brief chapter in his career--and maybe not even the important one.
Well, it was important in that he will be remembered for more for his Trek episode than his other stuff, sadly. But you are right, he was a very good (possibly brilliant) writer and satirist. Two of his short stories, I Have No Mouth and I Must Scream, and "Repent Harlequin", Said the TickTockMan were stories I remember being exposed to in reading class in grade school.
I think Ellison got overshadowed by many of his contemporaries, like Philip K Dick and Heinlein, but he was still an important voice in science fiction.