Zach Galifianakis delivers if what you are looking for in a comedian is a lot of one liners, some rage and a disjointed hour that lacks anything approaching cohesion. The sixty minutes of life which will never be recovered is punctuated by some in the audience who are clearly fans and laugh uproariously at shaggy comic even as he endlesslly checks his crib notes on stage to see what he is going to do next. Imagine Mitch Hedberg - now imagine how Mitch would do if you put him on stage today in his present state of animation and you have Zach Galifianakis in his finer moments.
Galifianakis is the kind of comedian some college age audiences and critics sing the praises of ( the kind whom more often than not is compared to the classic postmodern comedian Steven Wright as a source of legitimacy for the seeming inability to deliver a coherent set or even riff effectively with the audience). Comparisons to Hedberg and Wright could be fair if there were more than a handful of Cowardesque bon mots in the entire hour of one liners/prop gags and piano interludes.
The upside to all this is that given the talent displayed on stage you will never have to learn how to pronounce Galifianakis.