zhs, whether Google likes your site or not doesn't matter - what's more important is if other people like your site. In the first place, what you want is something that will attract visitors.
I would suggest trying to narrow your scope to something that you feel you could do better than some other sites out there. If you try to cover too much stuff, you have more of a risk of not being able to focus adequately on whatever you're doing.
I would say though if you feel strongly enough about it then go ahead and try it. See if you can get a small version of it done first and then get feedback from random people.