Proxmox is a powerful virtualization platform

The interface is easy to use for most of it, but still lacks screens for some configurations. Also, a few of the screens are not as intuitive as they could be. This is specially true with disk and network configuration, where some graphic/visual representations of the configurations would be very useful.

I believe Proxmox can be very useful for replacing jobs usually done by real machines, like deploying web servers, network services, etc. Its also an invaluable tool for companies offering a SaaS, as it permits to easily run different virtual machines with specific network configurations. I don't believe, however, that its well suited to very high demand applications, were a more easily scalable solution (like a cloud service) would work better.