As a performer, I recognized and really appreciated his talent. On "Three's Company" he managed to improvise and throw in hysterical expressions and physical comedy that weren't even in the script. I mean most actors can be funny with just the material they are given. But he went outside what he was required to do and added new dimension and humor to existing material. That's an amazing talent.
I saw him play a serious role on "Buffy The Vampire Slayer." Okay, well as serious as playing an evil robot can be. But he was convincing and scary. I mean he could actually scare me. I'm in awe of his talent. How sad that he will not be sharing it with us anymore.