The Imperial culture and way of thinking takes a lot of ideas from the ancient roman empire, their culture, way of thinking, everythin, they are no more generic than the nords, which are based off of the ideas from vikings and germanic peoples.
Sigh...This is why I hate the aesthetics applied to the Nords and Imperials.
They actually have very little in common with the Romans or Vikings and Germanic people when you get down to it. No more than the Nords are similar to the Egyptians or the Imperials the Chinese. There are similarities across the board. The thing borrowed the heaviest from the Romans and Vikings was aesthetic and little else.
Generic does not apply to a single race in TES. However the games tend to only give a cursory surface level representation so I cannot blame people for being ignorant of the true depth of the various races in TES, which tend to be found in books and dialogue.
Which is why I love the Dunmer. Good luck nailing them down to one or two cultural inspirations and being even remotely right...