Not much to critique here. You've shown us a cube. Make it less cube-y would be a start. Don't forget about Z-axis design. Multiple levels. It's really flat right now. Look at some old UT maps if you need inspiration.
Taking a break from my TRON environment to work on something a little different. This time it's a Warehouse Deathmatch Arena (working title). Right now it's just an open sandbox as it was just started. I'm not working from any particular concept art, just some referances that I googled up of real warehouses. That's…