Depends. I signed a guy with okay cores (well, very nice REB) who had 96 WE from Russia without scouting him much, and in the end he was high in REB/DEF and basically low everywhere else. I also scouted a guard from Italy whom I was very interested in landing, but after just two scouting trips I learned that he was low in BH/PASS and only average in SPD (and his SPD was pretty poor for a DI guard). I have seen plenty of internationals on other teams develop into superstars though.