Yeah, the Myth UI really sucks, especially the *new* "MythUI" that was released recently.
They take a nice 50" 1080p screen, and then pop-up a program guide onto it that consists of five channels by four 30min timeslots, in a massively huge font.
At least the old UI had options to change that to 9 channels by 12 timeslots, but the new-improved one doesn't. It also suffers horribly from arrow-key sandtraps.. right-arrow gets you into a sub-menu, but left-arrow won't get you back out. Doh!
I've already worked out a personal patch to fix the arrow-key stupidity, but (me) fixing the EPG is taking longer than I'd like. Still, gotta do it, cuz the nice under-the-hood stuff really is improved, but requires the b0rked UI on top.
Sorry.. pushed a button there, I guess.