I'm sorry, but "I was disappointed" and "I wish you would take steps" probably gets you grief. Asking usually doesn't. "Please" also helps (and its absence doesn't).

I mean, come on. I'm sorry company X site was all but useless to you. It would be nice if they made an extra effort to make it more accessible. But they don't have to. They spend their own money, time and effort to build the site, and they get to decide what their priorities are. Asking is okay, but so is refusal.