If you have a good experience somewhere using your real name and face to make a nice post is perfectly fine.
Even if you had an issue or two, I don't see a problem using your real credentials to post that either.
However, if you really want to write a scathing review of a place you might plan to return to in the future, using your real credentials is a really bad idea.
What do you think would happen if the waitress recognizes your face when you walk in the door or your name on the credit card as the guy that trashed her and the chef after your last visit?
I wouldn't eat the food.
That's why I have a second account for posting on Yelp and other places so if I really want to say what's on my mind I don't have to fear being subjected to tainted food on my next visit.
Maybe you didn't even write about the place you're visiting today but the server worked at the place your review caused to go out of business? The internet never forgets and neither do people that lose their jobs.
I'm not saying to hide and be a coward, I'm saying protect yourself from undue attention and potential poisoning because speaking out with your own credentials can get you in trouble.
Also, don't use a lot of specifics about your visit when you post because you might have been the only customer that ordered that dish all night or mentioning a server by name and the night it happened might narrow it down as well. That server might be able to figure out, based on what happened that night, who wrote that review even if it was done anonymously. The more vague you are the better.
However, if you never plan to return, you might feel empowered to blast away using your real credentials but don't forget that servers, chefs and even owners change where they work and my experience has been more people remember me than I remember them. For instance, I walk into local places all the time and servers I don't initially remember often bring me my favorite beer without even being asked.
Just remember, even if you don't plan to return to some place sometimes you get roped into going anyway with an office party, some family group thing, stuff just happens and there you are with a target on your plate if you aren't careful.