I think y'all postin in a troll thread. I remember seeing this guy about, and most of the threads he creates are all like this. While I do encourage discussion, im not sure its possible with this guy/girl sometimes, he/she doesnt really take critisism that well or listen to reasons people give relevant to the topic. I do hope this changes in the future but asking "why is game x popular" or "why is game x more popular than game y?" seems kinda...trollish. Frankly, he/she should know by now why a lot of people like it, with the billions of skyrim threads that popped up over the last couple months.
As for why people like elder scrolls games, and skyrim in particular? Well, its an open world game series where you can do anything at anytime. Its non-liniarity is a trademark of the series. You can be who you want to be in that gameworld, whether it be a wizard, rogue, warrior, or any mix of those. Heck, you could even just roleplay a merchant if you wanted to, and just level up speechcraft and merchantile. While there are glitches, not many are gamebreaking and it would be unreasonable to expect the devs to get every single bug out. I love the series, just like I love the zelda series, but when I dont feel like playing our hylian hero, I like the option to play my dark elf assassin with a heart of gold.
In conclusion, please do more research before you go asking such questions. A quick search bar check will give you many many threads answering your questions. Also please be a bit more open minded, not everyone will agree on everything, but a little consideration into another persons point of view can do wonders.