Right, that much is clear. As mentioned, I understand why the like system was implemented, but what good is it really other than just another brains system? Especially since last time I checked, we even have brains turned off in off topic forums/sections. If people were straight up abusing brains, that would be one thing, but as I said, I think everyone generally has the same idea on which posts deserve brains. Whether it's just a well structured post of input or opinion, or something original that took some effort. If I "liked" the post enough, I'd give them brains.
Some folks may get brains they don't feel are deserved, it happens. But I hardly think people are going to take the word of someone with more brains than others as law. Again, if brains are being abused (which they never have been so far), that would be one thing. But even then you could implement countermeasures to prevent that such as turning off the brains function in various forums or limiting the amount given within a 24 hour period if necessary. But so far this "like" system is basically the exact same thing. Especially since it publically displays a count for your total amount of likes.
If it were up to me, I'd say go with one or the other. No need for both.