My ds doesn't seem unhappy but says he hates his school. Only been there half a term, from various anecdotes sounds like he's having a fair bit of fun, is popular and settling in according to teachers, his dad & my mum etc think I'm worrying over nothing.
I don't want to 'not hear' him though IYKWIM - is it just what boys say? I hated every minute of school at the time, but thought things had changed these days.