When we want to express that something is not impressive or is not particularly noteworthy, we often use the phrase "that's not saying much." However, there are many other phrases that can be used to convey the same meaning. Some alternatives include "faint praise," "damning with faint praise," "underwhelming," "mediocre," "unimpressive," "nothing to write home about," "hollow," "lackluster," and "ordinary." All of these phrases suggest that the thing being discussed falls short of expectations or fails to impress in some way. So next time you want to express that something is not saying much, consider using one of these alternative phrases to add some variety to your language.