GhostSalsa
Emperor
I would vote for tall empire bias, but I voted other because I think the real problem is social policy imbalance. Even with the consulates nerf, tradition and rationalism are just better than everything, regardless of your empire. I don't just want to make wide viable, I want to make conquest/honor viable, piety to become better at establishing religions (right now in my opinion tradition is better than piety for empires with faith natural wonders, which I think is ridiculous). Exploration and commerce both have useless policies in them, which hurts the trees quite a bit.
The problem can be approached from either direction, really. To say the reason Tradition is better than Liberty or Honor is not because it's bonuses are more substantive, but because there's insufficient reward for expanding or for conquering before 200. There's only wasted effort. Liberty and Honor successfully help with something you don't "want" to do in the game.
I would look at it this way because I like both trees a lot - they buff the "active" parts of gameplay rather than Tradition's passive benefits - I just feel completely hemmed by the game mechanics before Industrial.
On the other hand you're right on with Commerce and Exploration critiques, though I like being encouraged to leave trees unfinished (more variety) it should be via stronger bonus flavors, not useless policies.