There are some good things to say about Gary, but I think he's an intellectual lightweight. Not only does he seem to have a shaky grasp of libertarian ethics and economics -- he doesn't even seem to have much intellectual curiosity at all.
Tom Woods did an analysis of the Johnson/Weld ticket on his show today, and while Tom sometimes disappointed me with his analysis of Rand he was spot on in his analysis of Gary Johnson. I hoped that Gary would have took some time between 2012 and now to read up on Austrian economics and the libertarian tradition to build a more coherent and consistent set of principles. However, as Tom noted today it seems like he didn't do much reading at all between then and now.
Gary is without a doubt better than Hillary, Bernie, or Trump -- but his VP choice is not so good and it could be argued that he's simply a socially liberal Republican. Vote for him if you wish, but I'm hoping a senior adviser joins the Johnson campaign with more libertarian bonafides to help him smooth out some inconsistencies he holds.
What's funny about all of this, and I think most would agree, is Rand pretty obviously more libertarian than Gary, even while he was running for president (for the REPUBLICAN nomination mind you). Senator Rand Paul is no question more libertarian than Gary.