The phrase "middle of the pack" means being in an average or moderate position among a group or competition. It suggests being neither the best nor the worst, but rather somewhere in between. Full definition
Come in middle of the pack with no real pressure seems to be working for them. (sbnation.com)
They are, in fact, projected to land middle of the pack of a select group of countries that is, at this point, fairly limited. (canadianbusiness.com)
Effective rent growth of 0.1 percent for the quarter was only middle of the pack, but annual rent growth of 1.8 percent was decidedly better. (nreionline.com)