Hmmm, of the comics I am subscribed to right now I think the only one that has absolutely nothing to do with Batman or Superman is The Flash, as long as you count Batman's former/current sidekicks as being Batman related. If not, then also count Teen Titans (which is lead by Robin) and Titans (which is led by Nightwing). Detective Comics is kind of shared between Batwoman and Batman, with some focus on Spoiler, Red Robin, Orphan (Cassandra Cain), Clayface, and now Batwing. I picked it up as a fan of Red Robin (Tim Drake), which kind of sucks a little right now because he has been... *ahem* removed from the plot for the time being.
Bear in mind I'm only restricting myself because I'm trying not to blow a shitload of money while I'm unemployed. If I were more willing to spend money I'd probably be reading Wonder Woman and Green lantern comics too. But as far as DC comics go, my priority is The Flash, then Superman, then Batman. Right now, I'd probably rate Batman as my least favorite comic of them all, but it's still not bad, just kind of "eh" sometimes.
Yes, funnily enough, there is nuance to my opinions as a DC fan. Weird how generalizations like "people only like DC for Batman" kind of fall apart under any scrutiny, isn't it?