Changing to POS + MN was a great decision , monday cant come fast enough

show me at least one good approach in any PoS interpretations - besides the fact that PoS is the compete opposite of brilliant PoW and just centralizing asset around holders with bigger bags - there was no good looking approach anyway. so walk me thro how is moving to PoS is a great decision?)
There won't be 51% attacks via PoW and a similar attack via PoS is a little more complicated especially since there are masternodes.
One big attack vector removed.