Hugo was born out of Google so it has all of the same benefits and drawbacks as every Google project (both internal and external):

• Lots of capabilities. You name it, it's a feature.
• To support all of those capabilites, there's abstractions for everything -- enough to make you go a little insane if you have to go through the code.
• Lacking documentation. Nobody gets promoted for writing docs, so if you really need to know how that feature works, you have to go through the code.
• May be abandoned at any time (but pull requests/CLs are always welcome).