whmcs sucks imho... basic and great for kids hosts, but not that best for serious hosting.
Noob, you don't know what r u talking about. So many companies using WHMCS and they will use it for a while i know. I worked for a web hosting company (one of the biggest West European hosting company) and they are also used to WHMCS.
When you say basic and great for kids host you just saying "heyhey i'm a kid and i don't have many post here" ... come'on and grew up.