Traditionally, golfers expect they should be able to two-putt greens. When greens become more demanding or penal, golfers tend to complain. Look no further than discussions on this board re: the USGA's Open set-ups.
Personally, I like a green with elements of challenge and danger.
Holes are more interesting when they require strategy, planning, risk, and reward. But, after generations, the notion of par has become sacred. If you're talking about making greens more difficult as a defense to added length, I'm for it only if those holes treat all golfers equally and fairly. Otherwise, an intentional three-putt green sounds a lot to me like miniature golf.
Would love to discuss this some more....but I'm out of computer contact for one blessed week.