While I do observe this in theory, in practice I've found that some newspapers/magazines/websites just do a better job in certain subjects than others. One wouldn't expect Top Gear to be 100% correct in an article about floral arrangements, after all. I've noticed this a lot for local news channels; they're great at covering local events (that's their specialty) but terrible at covering world events (which is very much not their specialty; the better ones stick to the key points instead of trying to go in depth, which is smart).

So a publication totally butchering a subject is certainly cause to get a second opinion for other subjects, but not necessarily cause to discard the publication's take on those other subjects outright.