I'm just starting to get into nhibernate (and ORM solutions in general). My question though is when is an ORM solution the right approach and when is it just overkill?

If I had to create a one-page intranet website with 20 lines of code, for example, an ORM solution would be overkill. So just curious if there's any kind of general rule as to when nhibernate is right for a project or if it's really just more of when it "feels right" for me to use it.

Thanks.