A lot of FPSes from bygone times tend to feel a little lifeless, particularly when compared to the modern experience. Luckily this isn't a problem that Shogo suffers from. The gameplay switches between on-foot shooting and a mech-based stomp 'n' shoot, although both essentially play similarly. The weapons all feel powerful (with the exception of the crappy melee offerings, but there's always ammo for the guns anyway) and have suitable impact on your fleshy targets.
Despite some hideous character models, the cartoony style means that the graphics aren't as repellant as some other games, and the controls require only minimal tweaking to suit the modern player.
The only real problem is the bastard-hard difficulty. Bullets *hurt*, and there are way more enemies than there of you. A quicksave facility makes things less frustrating, but be prepared to re-do some of the more testing sections a fair few times.
Overall, a tight game that has stood the test of time and is well worth getting. The challenge it provides will keep you playing for some time yet.
Also, it's worth noting that on first play I encountered some technical issues (most notably the Windows mouse cursor hovering in the middle of the screen), but GOG's support FAQs provided all the answers I needed to iron out these creases. Good show, fellas!