not something to write 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 something to write home about." His performance hasn't been something to write home about so far. To be honest, we were expecting much more from him when we recruited him out of Dartmouth.