Don't rely on memory, his record is just not great:
http://content-uk.cricinfo.com/newzealand/content/player/37491.html
(Not even a List A century! Striking at 57, that was rubbish even in the 90s)
I think if you think about these things too much, they get a bit stupid, because they're obviously academic... but you'd have to say, that batting has improved (and changed) massively in the 30-40 years ODI cricket has been around... sure, the rules have been changed in favour of the batsmen, but there's also been a lot of psychological barriers broken, i.e. players have figured out how to take calculated risks a lot more, which pay off more reliably.
So Larsen may have been good at the time, but if batting has improved, maybe he wouldn't have been as good today (and bowlers who get a higher RPO are actually better than him, because they're facing better batting techniques). Or maybe he would've adapted and been even more valuable. Who knows? You just can't make those comparisons reasonably.
(Don't think I'm knocking Larsen, he was a great player)