Or, it's a test. My wife sometimes needs to hire clerical workers. The help-wanted ad she posts end with "Fax a resume to...". I looked at the ad and said, "Fax? Who has a fax machine any more? You should give them an email address!" She says no, the instruction to fax is intentional. She wants someone who can A) follow directions; and B) is resourceful enough to find a fax machine. This is not a high barrier to entry; think of it as the FizzBuzz of office help. In fact, that's exactly what it is, a way to weed out the absolute dregs before you start.
I'm not saying that filling out an awkward online form is necessarily a test for a tech job, but it may be... Can you follow directions? Can you restate your prior job responsibilities in a format other than your prepared resume? And, let's face it, they're asking you to do the data entry of basic information such as name, address, phone, etc. Key-punch operators are a thing of the past. Nobody's paying people to copy hand-written information off of paper and into the database anymore. If you're such a prima donna that you won't fill out the form, why should I even consider hiring you? Asking for a mailed application simply on the grounds that "your web site sucks" (even if it's true) only makes you look conceited and arrogant.
(Full disclaimer: My company's online job application sucks. It's not a test, it's just a poor purchasing decision that was made by a different department. I've argued to make it better. Still, it's not impossible to get through as evidenced by the fact that we have people successfully applying every day. If you can't or won't make the effort you're probably not someone I'm going to want to work with anyway.)