Do you know if any of your choices in the first game carry all the way over to number 3? like import 1's save into 2 then that save into 3 and say for instance a character that died in 1 is still dead in number 3 maybe?
I own all 3 of the witcher games so it is something i could give a go.
Witcher 3 has few callbacks to Witcher 1, but afaik none of the choices in TW1 have any impact on events in TW3. You can import save from TW1 to TW2 and see a bit of consequence there, but TW3 takes place another 6 months after TW2 in another location, so events from TW1 do not play a role there.