Some multiplats sell better than some Sony exclusives

That's because PS exclusives appart from 2 or 3 franchises don't have as much quality like Xbox and Nintendo ones

This gen PS4 will have the most third party support and most exclusive titles, with Nintendo again having the least.

I'm not really sure what you want us to discuss.

Sony will never outmatch Nintendo for exclusives... arguably The Last of Us was as good at being what it was as Mario Galaxy was at being what it was but speaking in terms of the collective I don't see Sony 'out-doing' Nintendo for exclusives, especially since they didn't really manage to during the 'core fan disservice' that was the Wii's library.

They could be turning into an Xbox where it basically lives on 3rd parties.......but I think we need to wait for a killer sony ip.

Because of "pretend exclusives" such as Watch_Dogs.

That's entirely subjective, and I personally don't agree with you.

What I'm talking about is numbers. The PS4 will end up having more exclusive titles overall than the Wii U- be they third party exclusives, indie titles or AAA releases. 

I'm not sure what's to be discussed either.
PS4 is already well known to have superior versions of multiplat games. Thus most people will buy them on that console, and surely many multiplat games will outsell PS4 exclusives.
Half as many people (as can be evidenced so far) buy multiplats on XOne, which will in turn give XOne exclusives an easier task of outselling those multiplats.

Time to bring out Skyrim PS4 version... I know I would buy it day one. OT though, I don't really buy Sony games. My PS4 is for multi plats and WiiU is ofr Nintendo only stuff.

Pretty much yeah. The more 3rd party support a system receives, the more it becomes the case.