Natto has a very distinct flavour, so a lot of people don't like it.
Natto is quite an unusual kind of food, so very few people like it.
ーNatto has a very distinct flavour, so a lot of people don't like it.
「納豆はとても癖があるから苦手な人が多い」
a very distinct flavour「とても特徴的な味」を使って「癖がある」を表現すると良いでしょう。
ーNatto is quite an unusual kind of food, so very few people like it.
「納豆は癖の強い食べ物だから、好きな人は少ない」
quite an unusual kind of food「とても独特な・変わった食べ物」を使って「癖のある」を表現することもできます。
ご参考まで！
カナダ 
