imho esxi is not the right choice if you want to virtualise desktops and need 3d gfx, because esxi itself does not support graphic cards with acceleration. There is no such a thing as amd/ati or nvidia graphic driver for esxi. And it should stay that way, because gfx-drivers would make esxi unstable. Saying that, any 3d offered by esxi for VM is pure software emulation.
If someone needs virtual machine with quite good 3d-acceleration support, then VMware Workstation or VirtualBox is better choice. Those are not supervisors, but virtualisation platforms sitting on the top of common OS, and can utilise 3d-graphics of host system. Some time ago I made a few tests, and it looks very promising. I was able to run older versions of 3dmark in VM, some games (up to dx8), and even 3d cae software.