I don't mean this in a cynical way, but how come you didn't expect a literary classic to be well-written?
For the russian classics the translation trend for decades has been a little more terse and less ornate sentence-by-sentence. Which I think flows naturally and makes it feel more modern to contemporary english speakers. This often surprises people! But the russian classics can be a more fun, modern-feeling read than the english ones.
It's one of the advantages of translated works. They can be continually retranslated into the target language as its vernacular and cadence changes. Same-language works are stuck forever with the dialect of the time, and "paraphrases" into modern vernacular are met with much more skepticism than new translations are.