Okay, I'll make a serious post because this thread is a once in a decade kind of thing and it'd be a shame to let it go. I'll be listing the games I believe defined the 2010's in gaming (not the 2010's in general, because for that it really is Pokémon Sword/Shield), so it's more of an objective look at the decade and less of a "these are my favorite games". Descending order, because it's just better that way.
5. Dark Souls (1 point)
I hate this game, but its influence this generation is quite undeniable. It's kinda crazy how it went from being initially a niche game, to what it is now. "It's like Dark Souls" has become a meme for a reason, and as an avid hater of the culture it's created, I can't help but be annoyed everytime someone akins a game I like to Dark Souls, and it does happen often. So, yeah, it is decade-defining, i guess.
4. Grand Theft Auto V (2 points)
GTA V sort of epitomises everything that was popular in gaming over the decade. Open-world sandbox, check. Guns everywhere, check. Online multiplayer and social phenomenon, check. Maybe I should put it higher, to be fair, but 2 points will do because even an unbiased list is biased by human nature. I don't give a crap about this game, but again, its influence is undeniable.
3. Fortnite (3 points)
Fortnite doesn't epitomise everything that was popular in the decade, but it is by far the most prominent in the online phenomenon/eSports category. Truth be told, there were many other games that could fit in here, like League of Legends, Dota 2, Overwatch, and probably more I'm forgetting about, but Fortnite is by some margin the biggest thing right now and it's been that way for longer than I thought it'd be.
2. The Legend of Zelda: Breath of the Wild (4 points)
Conversely, BotW is by far the most prominent example of the open-world adventure which has been the most prominent style of single-player gaming. Again, many other games could've gone in here, like Skyrim or The Witcher, but Breath of the Wild is the new standard every game will be looking to emulate, and is currently the average gamer's favorite game ever, so, yeah.
1. Minecraft (5 points)
I don't think anyone can argue with this pick. Minecraft has been extremely popular throughout the entire decade, it's the best-selling game ever (I think?) and still doing insanely well. It was a cultural phenomenon that, at some point, just about everyone was playing, no matter if they were casual or hardcore gamers, single-player or multiplayer fans, older or younger, male or female or otherwise. It released at the very start of the decade and has remained one of the most popular games out there for all this time. Minecraft is everywhere.