Hi. I am shattered Galaxy player but the game is pretty dead. Is Diablo comparable at all?

Thank you,
Andrew

Never seen that game before. But Shattered Galaxy is an MMORTS. While Diablo is an ARPG.
Watch a couple of gameplay videos to check if Diablo is something for you.

Welcome to d2jsp

Diablo is vastly different. My suggestion is check out space engineers or star made. Space engineers is a game similar to SG but you really get meticulous in ship building. Star made is similar to Minecraft but space based, with a universe to explore on block form.