Is Westeros a good setting?

His language is pretty and his descriptions are engaging

Why do you think the setting is too complicated?

>Sunset found her squatting in the grass, groaning. Every stool was looser than the one before, and smelled fouler. By the time the moon came up she was shitting brown water. The more she drank, the more she shat, but the more she shat, the thirstier she grew, and her thirst sent her crawling to the stream to suck up more water.

Martin has been known for shameless fetish inserts before ASOIAF

Countless plotlines, literal hordes of minor characters, political system worse than Switzerland, I just don't want to keep this all in my head at all times.

Depends on the setting

It is heavily implied that the seasons are due to magic and entirely unpredictable. In addition, the people usually do prepare for winter without much issue, but the land has been buttfucked by literal years of war and what few peasants remain in what few fields are not ash can't feed the entire realm for a winter that will last a random number of years. The rest of your points are absolutely correct, but this at least is actually explained in setting.

>for a winter that will last a random number of years

Winters are typically equal to or slightly longer than the previous summer, which means the incoming winter will be AT LEAST 11 years.

That is explained explicitly by a maester in the books as peasants´s superstition. A long summer doesn´t guarantee a long winter. Also, if seasons are caused by the winds of magic or something like that, the arrival of Dany´s dragons, beings that have powered up with their birth all the magic in the setting, the lenght of the winter will probably be altered (for good or bad) as well.

As someone from Latino America I can tell you that most native languages are dying. Of course my country may be a special case since we kill most of natives early on making their absorption and submission much easier.

Yeah, it engages your gag reflex.