As with any series that runs for a few decades and is done by a bunch of different writers and artists, Dredd can be all over the place, genre-wise. I remember trying to get a friend into it, but he was turned off at some of the absurdities of the series (a specific example was a dinosaur turning up, which for long-time readers was no big deal, as it had been established quite early that there was a "Jurassic Park"-type zoo in the area that "now" was the Cursed Earth, but to somebody new it might have been a bit weird). It is very British, even though the characters and the setting are American. Also, some of the greats like Grant Morrison, Garth Ennis or Mark Millar have written for the series.
But there is more to 2000AD than Dredd. There's obviously the spin-off, Judge Anderson of Psi-Division (which has been pretty much completely written by Alan Grant), there's the mutant space bounty hunter Johnny "Strontium Dog" Alpha, there are the robotic ABC Warriors, the genetically engineered Rogue Trooper, the trippy fantasy Mazeworld, the scifi gangster thriller Sinister Dexter, the barbarian fantasy Sláine, and lots more, and pretty much all the great British writers and artists have at some point worked for the magazine. So, yeah, there's lots of interesting material to discover with this Best Of series.