PS4 software sales are actually quite good, despite what most people here are saying.
First, you have to remember that the Wii U launched during the holidays, and that Nintendo systems get a much larger boost during the holidays than Sony systems. Also, Nintendo 1st party software always do great numbers, but they are few in number. Sony systems, on the other hand, tend to start off slow, with more variety in titles (due in large part to 3rd parties), and lower volumes for each title.
In order to properly gauge PS4's performance, you have to compare it to past Sony systems.
Compare the PS4 launch software in the top 20 to the PS3 launch software in the top 20:
01./00. [PS4] Knack # <ACT> (Sony Computer Entertainment) {2014.02.22} (¥5.145) - 309.304 / NEW
03./00. [PS4] Yakuza: Ishin! <ADV> (Sega) {2014.02.22} (¥8.600) - 82.540 / NEW
07./00. [PS4] Killzone: Shadow Fall <ACT> (Sony Computer Entertainment) {2014.02.22} (¥7.245) - 32.336 / NEW
08./00. [PS4] Battlefield 4 <ACT> (Electronic Arts) {2014.02.22} (¥7.665) - 24.799 / NEW
11./00. [PS4] Dynasty Warriors 8 with Xtreme Legends <ACT> (Koei Tecmo) {2014.02.22} (¥8.190) - 14.356 / NEW
13./00. [PS4] Assassin's Creed IV: Black Flag <ACT> (Ubisoft) {2014.02.22} (¥8.820) - 13.862 / NEW
14./00. [PS4] Call of Duty: Ghosts - Dubbed Edition <ACT> (Square Enix) {2014.02.22} (¥7.980) - 13.701 / NEW
15./00. [PS4] Tomb Raider: Definitive Edition <ADV> (Square Enix) {2014.02.22} (¥4.800) - 12.093 / NEW
18./00. [PS4] FIFA 14 <SPT> (Electronic Arts) {2014.02.22} (¥7.665) - 8.808 / NEW
20./00. [PS4] Need for Speed: ​​Rivals <RCE> (Electronic Arts) {2014.02.22} (¥7.665) - 6.602 / NEW
Total: 209097 (without Knack)
9. (PS3) Ridge Racer 7 - Bandai Namco - 21,655 - NEW
10. (PS3) Gundam: sales Target not in Sight - Bandai Namco - 21,310 - NEW
13. (PS3) Resistance - SCE - 13,545 - NEW
Total: 56510
The fact that 10 out of the 20 titles are PS4 titles bodes well for the system. The numbers are low mostly because Knack is bundled, and that software sales across the board are low. Most people were predicting sales of Yakuza to be 2.5:1 in PS3's favor. In reality, the ratio is only 1.7:1. Even in Japan, consumers are more eager than previously anticipated to move on from the PS3 to the PS4. That's excellent news.
Edit: even more proof, see Vita's 1st week software sales, note that Vita actually pushed more hardware than the PS4.
07./00. [PSV] Hot Shots Golf: World Invitational <SPT> (Sony Computer Entertainment) {2011.12.17} (¥4.980) - 61.412 / NEW
08./00. [PSV] Uncharted: Golden Abyss <ADV> (Sony Computer Entertainment) {2011.12.17} (¥5.980) - 48.224 / NEW
18./00. [PSV] Dynasty Warriors Next <ACT> (Koei Tecmo) {2011.12.17} (¥6.090) - 29.181 / NEW
19./00. [PSV] Lord of Apocalypse <RPG> (Square Enix) {2011.12.17} (¥5.980) - 28.742 / NEW
Total: 167559