As for games to pick up with the Xbox One at launch: (my opinion of course)
Assassin's Creed IV: Black Flag: Since 3 was underwhelming (wait for review, maybe a rental)
Battlefield 4: Looks great (purchase at launch)
Call of Duty: Ghosts: Looks like CoD (rental for single player campaign)
Watch Dogs: Looks great (purchase at launch)
I agree with the pick up's, except do we really need to rent CoD to know that the dog is going to die and leave everybody emotionally unstable. (But if you enjoy the campaign definately a rent, but not a buy)
I am extremely happy that it seems that the reign of CoD as the top selling shooter has ended, people used to laugh whenever people bought one of the yearly sports titles when they KNEW they were essentially the same, with some small changes, and with a new one out next year pretty much guarenteed. COD:4, the first modern warfare was freaking AMAZING. But it came out on november 5 of 2007, exactly 6 years before Ghost's releases... So that means (counting 4) we have 7 CoD games in exactly 6 years. There comes a point where you just need to slow down, and/or stop making so damn many.
CoD has a dog... BF4 HAS FREAKING DESTRUCTIBLE SKYSCRAPERS, with functional elevators and multiple level's to fight on.
Assassin's creed is pretty much going the same way, with a new one out year after year, call it AC 4 if you want, but I still think of it as AC 6 considering they had two other "Assassin's creeds" almost right after eachother. If 3 is anything to go by, just wait for it to drop in price.
It will sell well (even if mediocre) if only because it is a launch title, but you will be able to find a used one (Or one on sale) fairly shortly after launch. So I agree with the wait on that.
Regarding Watch Dogs, of COURSE I am buying this at launch (I think everyone will be.)
The immediate exclusives I can't see much desire in. I mean do I really wan't to buy them at launch just because they are launch titles? I know I would definitely wait otherwise.
Ryse seem's to just be Xbox trying to compete with God Of War.
Dead Rising 3 just, I mean it look's nice, but the first two games weren't truly AMAZING if we are being honest. I'm thinking it's grand theft zombie from the looks of it.
Forza 5 I'm not much into racing games, although they are some peoples niche, and is best judged by one of them.
So I'm not really set on the launch exclusives, but Watch Dog's and BF4 are definitely gonna be XB1 for me.