It's debatable that H.264 and MP3 patents are bad. These were non-trivial to invent and are worlds apart from slide to unlock or hold-the-shutter-button-to-record-video. They don't patent the general process of compressing video and audio.
Once granted, a patent give a benefit to the inventor, as well as a cost to society at large: monopoly. I think it is fair to say that the costs of monopoly always exceeds the benefits: you can't justify having the society as a whole pay such a cost for the benefit of a lone entity.
The only way to justify such a cost to society, is an equivalent benefit to society. If it turns out an invention would not have existed without the patent then the patent may not be that bad. But if would have existed anyway, then the patent is a net cost —bad.
Reading my sibling comments, it seems H.264 and MP3 patents were not instrumental in the coming of those technologies (efficient audio and video compression). Those technologies would have been invented anyway. Which means these patents didn't serve any real purpose, and their costs (monopolies) are therefore unjustified.
In a word, Bad.
I get the impression from reading about Daala, VP8/VP9, and x264 that there are fundamental building blocks that are patented and used in threats. We have open source researchers who are just as willing to make high quality codecs as the MPEGLA members, but their time is wasted by fear of lawsuits and working around obvious patents.
I'd suggest that anything that becomes an international standard should have FRAND licensing for all patents, enforced by treaty.