What I liked about the New Jedi Order was that it took the lesson of Return of the Jedi, which isn't really spelled at all that well (which is shocking considering that Lucas felt the need to add Vader's verbalizing as he chucks Palpatine down the reactor shaft), and focused Jacen's hero's journey and the series around that lesson only applied on a much larger scale.
I think Stover put it best in Traitor through Vergere:
"You need not like someone to love him. Love is nothing more than the recognition that two are one. That all is one... That knowledge is the seed of greatness."
And that really goes to what Reep posted.
As for the old Jedi order, I think their largest problem is that they were overly dogmatic, their dogma was contradictory and self-defeating, and it made them ill-equipped to deal with people outside their ivory tower. The Jedi were pretty much making themselves extinct through declining numbers due to the age limit that they put on training and their prohibition on relationships (and presumably procreation, and if not, that rule alone limits procreation of FS). Consequently they were only 10,000 strong at the time of Episode I.
Since they're raised from childhood in the Jedi temple and don't interact with anyone but other Jedi I think it seriously compromises their notion of empathy, and through that their compassion -- universal, unconditional love.
"Trust not the words of a poet, as he is born to seduce. Yet for poetry to seize the heart, it must ring with the chimes of truth.”
“The world is understood through metaphors. Language is a metaphor-system. Mathematics is a metaphor-system. All real-world schools of magic and religion revolve around the understanding of vast metaphor-systems, symbols as they relate to concepts."
"See, the thing is, everything everyone tells you is a lie. The truth is always bigger than the words we use to describe it."