One of the reason I go to the French Cafe is for the Yunnan Coffee and the Cheeseburgers - the latter of which I think are the best in Kunming. The french fries are also pretty excellent! But then again, the staff and the owners are quite nice too.
I have made it a habit to order at the bar when I enter most of the cafes on WenLinJie. Otherwise, I just take it for granted that one will have to wait.
I really think that the French Cafe should definitely get rid of their WiFi (aka Why fry?) system though - since it can make people irritable. Recently, though, I have been getting better service there and the staff seems to be making an effort to be more friendly. Too much exposure to EMR (from cell phones and WiFi) can make people listless and irritable. Moreover, it is well-known - in some circles - that this is indeed most likely the cause of ADD (Attention Deficit Disorder) so for those who want to study in a WiFi cafe, you might actually be defeating the purpose of studying - since it can affect concentration and memory.
I like the French Cafe, but I am annoyed by people who lack consideration of those around them by frying the brains of those nearby them with their microwaves transceivers (i.e. cell phones) or by smoking. :(
The first cafe to make their establishment non-smoking on Wen Lin Jie will definitely attrack a nich-market of non-smoking customers. Many foreigners (and some Chinese) are extremely annoyed by this habit and often will get up and leave when someone near them starts smoking.
Often too, are people who come into one of these cafes to only order a cheap drink so that they can surf the Internet for hours. I don't see it really being profitable for the businesses to offer this "service" to attract customers - who in actuality are not there to eat, but rather to use the WiFi.