Very few birds will nest in it, although it's great for sparrows to pick the spiders out of through the colder months. I'd disagree about the timber, it's horrid to carve, virtually impossible to split and takes years to season properly for firewood. It does smell nice when burned and I can't disagree about the growth rate - the previous occupants of our house planted a 'dwarf' one in the front garden which turned out not to be so dwarf. It was about 16 feet high when we moved in and was over the roof line when I cut it down 2 years ago, only 2 years after we moved in.
We're going to replace it and the two others, now all removed, with hazel and a small fence. Sure, it won't cut out anywhere near as much light, but with a little luck the nuts will taste a bit nicer.