There are a lot of things that draw gamers to purchase a new console and those include things like cool controls and great graphics. One of the things that most draws gamers to part with their money on new hardware are exclusive games that are only offered on said console, but those games have to be appealing.
Nintendo is pulling out all the stops on the Switch and the console is getting a bunch of exclusive titles that are helping to sell lots of consoles. In fact, the Switch will have more exclusive game titles in nine months than the Xbox One had in all of 2016 and 2017 combined.
Microsoft is catching lots of flack for not spending money on exclusive titles which means that the exclusives end up going to the competition.
Exclusive games for the Xbox One in 2016 and 2017 totaled nine titles with Forza Horizon 3, Gears of War 4, Quantum Break, ReCore, Dead Rising 4, Halo Wars 2, Crackdown 3, Super's Lucky Tale, and Forza Motorsport 7. On the other hand the Switch has ten exclusive titles since its launch in 2017 with games like breath of the Wild, 1-2-Switch, Mario Kart 8 Deluxe, ARMs, Splatoon 2, Mario x Rabbids: Kingdom Battle, Pokken Tournament DX, Super Mario Odyssey, Fire Emblem Warriors, and Xenoblade Chronicles 2.
Gamingbolt points out that some of these "exclusive" Switch titles are offered on the Wii U, but some of the Xbox One "exclusives" are also offered on the PC so that argument is a wash. Another important tidbit is that the Switch has better selling exclusives on average. Some of that has to do with the fact that there are fewer games on the Switch right now so gamers have less of a choice, while the Xbox One overall catalog is much larger.
Gamers have to wonder with the Xbox One X in the works, if Microsoft focus on more exclusive titles. Gamingbolt figures that the much larger exclusives catalog is why the PS4 is outselling the Xbox One 2:1 right now. The publication also figures that the exclusive games are the reason why Nintendo is selling so many Switch consoles. Nintendo also has a leg up with exclusives that will never be offered anywhere else in the form of its first party titles like Mario Kart 8 Deluxe and Zelda. If you want Nintendo franchise games, you buy Nintendo hardware.
However you look at it, Microsoft has been sleeping at the wheel when it comes to exclusive games and it doesn't seem that the issue will get better in the near term.