vSphere is an excellent product to virtualize computing workloads. It helps with consolidation of servers and datacenters, and increases utilization of computing resources. The product is very stable, and contributes to high uptime for critical workloads. Additional benefits from a virtualized datacenter include reduced power and cooling costs.
Room for Improvement:
Many features have been added over the years which makes it difficult to deploy without formal training. License costs are fairly high, especially compared with substitutes that are quickly catching up in performance and features.