Something which is nothing to write home about is unremarkable, predictable, expected or not very interesting. When you say something is 'nothing to write home about', it means it is not worth mentioning or talking about.

1. The hotel I'm staying in isn't bad, but it's nothing to write home about.
2. There is so much hype around that movie but, honestly, it was nothing to write home about.

1. Jack's performance has been nothing to write home about so far. I really expected a lot more when I hired him.
2. The new office building is fine, a little bit nicer but nothing to write home about.
3. The client here is happy to renew their order but isn't looking to increase anything at the moment, so nothing to write home about.