Underrated? Yep, I'd say so...

or, once again, I Get Referrals, from this search: underrated 10mm auto cartridge.
Yep, I think the 10mm is quite underrated. A lot of folks would point to the .40 Smith & Wesson as the best of the 9mm and .45 worlds, but I think the 10mm is a better one — heavier than the 9mm and much faster than the .45, even with bullet weights approaching the .45, and in most cases faster than 9mm, even. Those hot loads are no doubt a handful, but they are in any pistol. I'll admit I haven't driven my homemade 10mm rounds as fast as some folks do, but a 180-grain bullet at about 1200 fps or a 155-grain bullet at 1400 is still damn potent for an autopistol — and surprisingly easy to shoot, too. To steal Ferris Bueller's words, "It is so choice. If you have the means, I highly recommend picking one up." I have two of them myself...