The phrase "tepid reaction" means a response or feedback that is not very enthusiastic or passionate. It suggests a lack of excitement or interest towards something. Full definition
When the Samsung Galaxy Tab 2 was announced, it met with tepid reactions because it basically had the same specifications as the previous model. (goodereader.com)
Companies that beat estimates yet were unable to demonstrate organic growth tended to see tepid reactions to their «beats». (hartfordfunds.com)
On the critical side of things, Song of the Deep did pretty well, but users had a more tepid reaction, citing poor performance and its inability to live up to other games in the genre. (thegamefreakshow.com)