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%.
- builder ability: Abilities that build up points for your weapon (up to a maximum of 5).
- consumer ability: Abilities that spend these points and usual do more damage/heal than builder abilities.
Other source:
Why do I need two weapons? What's wrong with just one?
The game is balanced around the type of damage output you can do with one builder ability to create 5 resources for two different weapons, followed by using consumer abilities from each weapon back-to-back, and then repeating this general process. If you have only one weapon, then you have only one build cycle followed by one consumer, and you are essentially putting out only 60-70% of the total DPS that you could do if you were using two weapons.
So don't try to skill up only one weapon to "max" Skill 10 ASAP, because you're seriously gimping yourself by doing so. Right from the start, as soon as you roll into the Sheriff's office in Kingsmouth for the first time, you will receive your choice of a second weapon, and you should always roll with two weapons at all times. Three of your active abilities in any 7/7 build should always be: A) some type of builder that will build for both weapons with each hit, B) A hard-hitting consumer for Weapon 1, and C) a hard-hitting consumer for Weapon 2.
Source: http://yokaiblog.wikidot.com/guides:tswfaq
No, you cannot 'Respec'.
Spent points stay spent. However, this matters less than your equipped abilities, which (once learned), can be changed at any time.
New Skills and Abilities are Cheap.
Getting to a basic level of proficiency at which you can comfortably adventure with a new weapon takes a fairly minimal investment. You don't need to max things out to be able to comfortably use that shiny new Blade you just decided to switch to, and you can always go back and repeat some easier quests (All quests can be repeated periodically) if you need some easy and quick XP. Which brings me to...
Skill and Ability points are plentiful.
Seriously, you will be swimming in points early on. More than enough to get a feel for everything that's going on, and easily enough to 'fix' any early bad decisions you might make. And besides, by the end of the game...
Yes, you can get enough skill points to max out everything.
Character growth in The Secret World has been pitched as 'Horizontal, not Vertical'. Which is to say that, if you focus on only two weapons, you can max yourself out rather quickly, yes, but there are enough skill points in the game to eventually max out every Skill and every Ability. After a point, character growth stops being about becoming more powerful, and instead becomes about having more choices. And the best part is that that point is wherever you want it to be. If you're not having fun with a given weapon anymore, you can change it. Anytime you want. You might need to duck back to some easier content for a little while, but that isn't a big deal anyway.
Best Answer
Expand the particular skill bar in question (hit the +) and mouse over the little tick marks instead of the button to allocate skill points. It'll display what the current tier gives you, and also what the next tier will give you (at the low levels I've hit, always just seems to be a slightly upgraded version of the same effect).