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By virtue of how close someone would need to be to use NFC, it is pretty secure. The range is no more than an inch or two, so someone would have to pretty much be in physical contact with you. Also, if you don’t keep it turned on when you are not using it, that would negate any concern I can think of. Still, I guess if is is on, there is some small chance of being compromised. Also, aside from NFC specific issues, there would be the same concern as using QR code, in that you could be directed to a malicious website.
Here is an article that goes further into detail about NFC and related security concerns, as well as some ways to mitigate risks. http://electronics.howstuffworks.com/how-secure-is-nfc-tech.htm