Bloated websites, that use a zillion tables for
layout, that wouldn't even validate for HTML 4.01
Transitional. Then when you try to be helpful and point this out, they get overly defensive, and claim, "there's no problem".
Worse, websites that think 1MB logos full of Flash (with the default audio on) is "kewl", and skyscraper high sigs are "fun" (and they're all sandwiched between 2 sidebars full of the same blinking and winking ads).
Then they wonder why they don't get the ad click-thrus????
Worst: heavily SEOed websites, that think cramming keywords is "proper", with maybe one paragraph of content sandwiched inbetween 100+ keywords (and forget navigation, as it's all keyworded too).