I think they're all up-and-down which is hardly surprising. The ones I read most often are Singletrack and MBR. MBR went through a poor phase, imo, under their last editor, but has improved considerably under the present one. Singletrack, conversely, I've not enjoyed as much the last few months as previously. I'm sure it will all come back round though.
I'd agree with the recycling of content though, particularly MBR on technical (maintenance) and route guides. And sometimes they're pretty lazy and haven't really got a big feature, just a compilation of small stuff, it sort of reminds me of those tv series like Mock the Week where the six part series is five plus an offcuts episode - like they'll run features through the year on trail centres, reviewing one per edition and then at the end of the year run a "big feature" on UK trail centres with a little summary box on each. Then I feel cheated.
At least MBR seems to have moved slightly away from the predictability of every single group test being about which bike is going to be runner-up to the Specialized.