No, I don't have a review disc. But I have the flier that came with it!
The flier's front shows the same art SNK used for the original Neo Geo release. Drawn by Shinkiro, it's a sampling of Metal Slug 3’s attractions: hidden tunnels, angry yetis, giant eels, walking eyes (say it like Doctor Venture for best effect), and a war between the standard Metal Slug villains and a race of invading aliens. Yes, Metal Slug 3 has all of this in magnificent detail. It’s a gem from SNK's hottest creative streak, which also included Fatal Fury: Mark of the Wolves and SNK vs. Capcom: Match of the Millennium. Of course, SNK followed up its greatest successes as only SNK could: by going bankrupt. That’s the SNK we remember.
The other side of the flier has another SNK staple: delightfully not-quite-right English. SNK was known for distinctly bizarre translations in its games, ranging from slightly strange wordings to victory quotes where characters were happy as oysters and kindly gave the palm to such a crock. This Metal Slug 3 flier doesn’t reach those heights, but it offers "diverged ways" and “the new scale of the game with funny and gimmicky style.” That’s also the SNK we remember.
Metal Slug 3 is easy to find today. Unshaken by Sony, SNK Playmore brought the Xbox version to North America in 2004, and the game is readily available in the Metal Slug Anthology and on Xbox Live Arcade. You'll find that Metal Slug 3 holds up rather well, even if its modern incarnations are missing something: an awkward translation.