World of Warcraft
I think I just play this game now because I'm addicted, not because I enjoy it anymore. It's a MMORPG and is pretty much considered the gold standard of all MMORPGs. You can pick from two different factions, each having 5 different races to choose from (or you can choose Pandaren and later choose which faction you want to be a part of), and 11 different classes that may or may not be available to the race you just picked, so it'd be important to pick which class you want first, then pick from that pool which race you want because race barely matters gameplay-wise. The only difference is where you start and minor racial abilities that barely play any significance in the long run, so the race choices are just there for cosmetic purposes only.
The classes are fairly varied. Some are more up close combat, some are long range attackers, others can flip flop back and forth, some use pets, some can heal, some can tank, so on.
So what's the goal of the game? Well, really you can pick your goal. For most the goal at first is to get to the max level. You can do this a number of ways: Questing, dungeons, grinding, hell some people managed to level without even killing anything. Of course it doesn't really matter since grinding is pretty much the summary of what you'll be doing regardless of which route you take. You can spend all your time killing things, or you can get quests that instruct you to kill things, or you can head to dungeons full of things to kill, but in the end you'll be killing things. There's barely any challenge to it, and it's repetitive as hell.
So why play it? Well the world is pretty dang awesome. I don't think I've ever encountered a game whose map I like more. There's so much variety in styles between landscapes, whether it be snowy terrain, forest, swamps, jungle, desert, canyon, and that's just the first 60 levels in Azeroth. Then you venture to the Outlands, which ranges between giant mushroom world to hellish dark landscape, to floating islands in a perpetual storm. Then on to Northrend, a huge snowy kingdom (while that may not sound as impressive, trust me it's wonderfully designed and has some of the best music in all of WOW). Then 5 different zones opened up in Cataclysm, such as an underwater kingdom, a giant Indiana Jones inspired world, an otherworldly dimension that formed in a giant vortex in the middle of the ocean, and of course the Twilight Highlands. I could gush about the world all day.
But it's not just the fact that these worlds exist, it's that it takes so frickin long to get to them. The fastest anyone has ever gotten to level 90 right now (at least that I could find) is 2 days. That's not real time, that's playing time. They had to spend more than 48 hours sitting in front of their computer mindlessly grinding on enemies and turning in quests. And that's if you know what you're doing!
There are alternatives to that though. You can also opt to NOT level your character at all, but instead run to the nearest capital city and start making your fortune in the auction house. The auction house system is actually fairly fun to play and can teach your kids basic economic principals if they learn to do it right. Higher level characters to can also run out to the world and gather valuable minerals and herbs and other stuff to sell, but the fastest way to do so is to buy those things at the auction house anyway and sell it right back for a higher amount. And it's so satisfying to run to your mailbox and spend time collecting all the won auctions and watch the money roll in. You might be missing out on the fantastic world around you, but hey you have money. Who's going to argue with you?
Overall, I'm sure there are better RPGs out there, but don't blame me for being addicted. Now excuse me I need to go grind some more.