I use PMP on my TV, and I don’t really like the “TV” UI (too simplified to my taste). I feel alright with the web UI. But the texts are a little bit small. With the browser version, I can easily increase the font size, but it is not possible with PMP. I guess it is a really simple feature to implement and it would be a really good change.
2022 clean-up: obsolete (PMP is no longer officially supported; please use Plex for Windows/Mac/Linux or Plex HTPC instead)