A web site is not the place to devote huge blocks of text to saying how wonderful you and your company are. It is not best used as a promotional medium, like a press ad or brochure. Visitors come to your web site not so much to learn about you, but to find something that THEY want.
*Writing for the web means writing with a different attitude, addressing different priorities. Talk less about yourself, and more about whatever it is your visitors are interested in.