You can download SOTN, Castlevania Chronicles, and Dracula X Chronicles on the Vita. It also has plenty of great side scrolling action games aside from that.
Like I've said before, I think it beats the 3ds in games and it obliterates the 3ds in hardware.
I think there are 2 reasons that the 3DS is doing better than the Vita, and they are pretty obvious.
1. Nintendo is more established in the handheld market and the 3ds is coming off of the huge success of the DS.
2. The second reason is that the handheld's consumer market seems to be dominated by the youth, and unfortunately, it seems like Sony has done very little to market the Vita to a younger audience in addition to the hardcore gamer. As it stands, the vita seems to be focused on bringing more console gamers into the handheld market than it is on taking the young audience away from Nintendo, and many console gamers are not interested in handhelds and don't even bother to take a close look at what the vita has to offer.
So that sums it up. I think the only thing that Sony is failing at with the Vita is the marketing.
The games are great and the library is getting huge. Playstation plus member can get games like Gravity Rush, Uncharted Golden Abyss, and Unit 13 for free from the ps store on the vita right now.
Just take the Vita out back and put it out of its misery.
The 3DS is where the money is... for any sidescroller CV's.
Actually they are releasing the Vita slim redesigned and in different colors this spring. There will be a price drop which brings the Vita and Vita slim down to about $180 which will match or be lower than the cost of the 3DS XL. There will also be a Borderlands 2 bundle for $199. So if anything, I think it appears that Sony has plans to push the Vita even more, as they should.