All anthology series are erratic. That is I think one reason why real series with continuing characters generally win steadier audiences: You know what you're getting.
The original Twilight Zone and Outer Limits had plenty of bad episodes, and the contintuations had plenty of good ones. (Well, perhaps not the Ira Steven Behr iteration.) So a new Twilight Zone would likely have a lot to offer, even if a modern version would almost certainly totally eschew SF and humor in favor of horror in fantasy mode.