How come our political activities never seem as serious, dedicated and organized as those coming from the Right?

because we don't have the fbi planning our operations for us

Corporations pay for the right, the left has to make do with, I don't know, whatever people can make after living expenses from their shitty jobs. Not to mention that liberals redirect leftwing energy into harmless social causes.

Its the difference between occupy wall street and the tea party.
Occupy thought going to the park and playing the bongos while a nigger yelled about the lack of black people in comic books.

The tea party voted and infiltrated the GOP warping it to its point of view

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Because you're only looking at your own country.

There are plenty of active and appealing left wing organizations across the world, but yes they are few in number at the moment. Find them and join them and help them grow!

The left is more organised at a local level than the far-right.

You mean occupy was an organic movement started by a bunch of broke people and the tea party was a movement initially backed by the single largest media outlet and some of the most powerful people in the country?

The right is generally stronger and more efficient because it's the best paid convictionless sons of bitches around who will do literally anything to win and have the resources to do so because that's where all the money is.

Right-wingers operate under paternal authority, their motto is to fall in line and do as you told. So they are (perceived as) 'manly'.
Leftists want to reconfigure everything under their universalist hysterical demands ("everything for everybody and right now") and they are obviously detached from the current libidinal reproduction of ideology (otherwise they would already fell in line). So they are (perceived as) 'feminine'.
Because phalologocentrism and whatever, masculine > feminine, so right-wingers are always 'serious' and 'business-oriented', while leftists are not serious and don't know what they want.
This is the case even when right-wingers peddle the most retarded debunked shit like washington consensus or austerity economics, they still come out as knowing what they are doing. People still vote for Tories, coz Osborne is a good body he ebin meme nothing wrong.
The problem is that the left doesn't know what it wants (6 billion of antagonistic sects prove that) and the right always knows what it wants (status quo and reaction against the left).

This is the correct answer.