not worth writing home about
To be not especially remarkable or noteworthy; to be rather dull, mediocre, uninteresting, or unimportant. A variant of the more common phrase "nothing to write home about." A: "Have you eaten in that new sushi restaurant yet?" B: "Yeah, I went there last week. It was OK, but it isn't worth writing home about." His performance hasn't been worth writing home about so far. To be honest, we were expecting much more from him when we recruited him out of Dartmouth.