I don't think anyone has stated that Fire/Fighting is a bad combo, and nor has anyone to my knowledge said that they don't like it as a type combo. Repeating ad nauseam that you don't understand why people have a problem with the same type combination on the Fire starter Pokemon for 3 Generations in a row is simply facetious. Repeatedly saying that those with the opposite viewpoint to you are stupid is not only facetious, but also unnecessarily provocative and more than a little bit bigoted.
Fact is, in games that promise as much revolution as Black/White, there is real cause to be disappointed in the lack of innovation in this area which is understandably very important to a large proportion of Pokemon players. As the starter Pokemon is the first one you get, and for a lot of people is the one Pokemon that accompanies the player on their entire journey from beginning to end, I think it's completely understandable to be a little bit peeved when the same type combination is used three games in a row. It certainly smacks of a lack of innovation and of the re-hashing of old ideas, especially in the case of Fire Pokemon - after all Fire is one of the types with the most unused possible type combinations.
If people want to be upset about Pokabu's evolutionary line's type combination, then they're more than entitled to be, and they have good reason to be, as indeed users of Tsutaja and Mijumaru would if their rumoured final stage types are to be believed - after all, plain Grass and plain Water could be considered missed opportunities as well. What do you gain by calling their views stupid or retarded?