The flaming camel is a very situational units, but it is fine, considering that Tatars have a great UU extremely gold efficient. I mean, even Missionaries or elephant archer are not top UUs, but at least their civs have another UU which is extremely powerful.
The problem is that some civs like Italians and Portuguese have both the UUs that are situational. Which is very sad considering that these two civs are designed to play with their UUs (GC should be the cavalry answer, while OG was the way to go for portos)