I don't think perspective is that much relevant. If someone says "This restaurant is the best in town", it means that of all the other restaurants the person tried, that one is the one he likes best. You don't need to be an expert to have opinions and feelings toward things. If you don't agree that restaurant is the best you can provide info why you think the statement "this restaurant is the best in town" is wrong.

The second person perspective is just a suggestion. Of course you're free not to go there if you don't want to.

Finally, the first person perspective is just one other way to put things. In this case it's more verbose and, before the second phrase, don't even give you as much information as the god's perspective (in god's perspective you know this restaurant is the one the person likes the most, in 1st person perspective you just knows this person likes it). Saying "This restaurant is the best in town. Cooking is great and it's very welcoming." gives you at least the same information as the 1st-person perspective.

I'm saying all that because I hate see people trying to debunk an argument by picking on the guy's perspective. Stuff like "you can't state that as an absolute truth", just because you said something like "this restaurant is the best in town". If you have information that may change that opinion, please give us, otherwise, don't flood the comments with "you don't know that much". That's about the same as DH2.