Most of the time liberty is stronger than Honor at least. I usually take it instead of Tradition now, since I find tradition boring. With liberty, you can go wide and improve your tiles quickly without having to sacrifice too much growth or production (for workers and settlers) in your city.
Well personally I always play with Reform and Rule mod which makes each social tree much more interesting.
When speaking about unmodded game... Tradition beats all other early trees, it is better even for quick expansion!
Honor can be good only for few civs and domination victory. Piety also only when you play very religious gameplay. Liberty... Well, I did some math and I have bad news - Liberty is completely useless
It gives you free worker, settler, golden age and great person. Cool but it gives almost nothing besides that. +1 production, culture and happiness is laughable and it is designed for a gameplay strategy which is alone not really good. Free worker, settler and golden age are IMHO 'comfortable cheat codes' as they save ~20 turns of production but experienced player can manage to build them without liberty and have even better empire with Tradition. Besides that, all these things are instant boosts which pass and leave not much for mid - late game.
Tradition provides much more happiness, early gold from Monarchy and Oligarchy, more early culture, provides bonus to defense (Oligarchy), wonder production, four free cultural buildings, four free aqueducts, much faster border growth allowing on quick development of cities and insane +25% food bonus. All these things are optimal for every game...
In the same time Liberty offers: free worker and settler, which are worth much less than four aqueducts; some happiness but despite that Liberty empires are much more unhappy than Traditional (especially as wide gameplay generally generates more unhappy); laughable +5% production of buildings, laughable -33% to social policies penalty; 10 turns of +20% production and gold (which still doesn't recompensates policies of Tradition and their accumulating effects) and the Great Person. Which is cute when you choose Great Scientist or Engineer, but even they won't recompensate scientific and wonder domination of Tradition. You can also choose Prophet or General, but Piety and Honor are better for that