The fun thing about The Secret World is that you can use any weapon you want. As my beginning weapon I have chosen the pistols.
Now I've been placing all my ability points in pistols. Just focussing on that afterwards I'm going to place my points in blood magic (the assassin deck for Dragons).
The question is, is placing the points in one tree good? You need more ability points to go futher, and that means waiting a few (quest/levels) to get the ability, or alternatively you can also go directly for some first blood abilities.
Best Answer
No it's not. You should also put points into the secondary skill tree at least to the point you get a good consumer ability.
The reason this is better is because most builder abilities are building up point for both weapons you wield. This way you will be able to double the output of consumer abilities and this will increase your damage (or heal) output at least by 15%.
Other source:
Source: http://yokaiblog.wikidot.com/guides:tswfaq