To racing fans Forza is a must play. The first dead rising was one of the original system sellers for 360 and the new one is a top 5 game this year imo. And plenty of people have bought the system just for Killer instinct. As for Ryse and the arcade games, they are good games to play in between the heavy hitters. Before march there will be project spark, then in march TitanFall drops.
Name any system in any year that had 3 system selling exclusive games within six months time.
Like I said, there are plenty of exclusive games to play on Xbox. The idea that there are no games, comes from Sony fans trying to make the launches somehow equal. Or people who own neither system trying to convince themselves they dont need them.
In reality, if you don't have a PC there are plenty of reasons to own a ps4 as well. All the multiplats are much improved over last gen.