He's the only politician I can think of who would stick to his guns even if it makes him extremely unpopular, so I admire him for that.
I admire his dedication to principles as well. I think he goes to far with it at times. There's difference (although admittedly it can be a thin line) between being very principled and just sort of stamping your feet like a child when you don't have your way. Compromise is not always a bad thing. For that reason, there's no way I'd vote for him for President. But it's good to have a sort of principled, pure, no BS voice in Congress so I had no real issue with him as a Senator or as a pundit/voice for libertarianism.
If you can show me one instance of Ron Paul lying to his audience in order to gain their favour, I'll be very surprised.
My issue with him is that he is very right wing personally. His libertarianism trumps his right wing-ism for the most part, which I do respect him for. But he's considered by many to be the "founder" of the Tea Party movement and his son is an out-and-out Tea Partier.
He has never really come clean about the newsletters (google "Ron Paul newsletters"), or why so many people who used to work for him have been later found out to be huge racists. Or why he courts extremists who to me hold very un-libertarian values. Or why he continues to run as a Republican while claiming to be Libertarian.
At worst, I get the feeling that Ron Paul believes in small government because he thinks government props up the blacks, hippies, gays, and freaks and if we simply pull the plug his side will win. At best, I would say that Ron Paul is not quite the pure voice he claims to be, which would not be such a bad thing if it weren't for the fact that he is thought to be above it.
I quite like Gary Johnson, who is the Libertarian Presidential candidate. I don't support his views but he is sort of what Ron Paul is supposed to be but isn't. If the supposedly small government "Tea Party" types really wanted to put their money where their mouths are they would vote for him. But they won't because he believes in gay rights and legalizing prostitution and smoking dope and things consistent with small government/libertarianism. Whereas the Tea Party's idea of small government is really more like let's just get rid of everything we don't agree with.
I might even have tossed a vote Johnson's way just to show my support for having another voice/party in the country and for certain libertarian principles I believe in but aren't represented by either major party. But the election is close, and I live in a "battleground state," so I couldn't afford to do it.