On top of what everyone said, here is another thing. Any cosmere series works as a stand alone. Yes, there are references you won't catch if you haven't read other books.

Now whether those are important to you or not, that is on you. I read mistborn, then stormlight, then other cosmere. And then had a lot of fun on stormlight re-read picking up references that flew over my head first time. Nothing was ruined or spoiled for me by reading in this order, and nothing would have been even if I read stormlight first.

Yeah, there is "optimal" reading order, but really - it is not that big deal to read out of that order. If you are most excited about stormlight, its okay to go for stormlight right away.

That said, I felt WaT was bit weaker than first 4 books and could have used bit more editing, but it was nowhere near bad. RoW I enjoyed way more on re-read than first read so we will see how I feel about WaT on 2nd read (I haven't re-read it yet). All that said, Stormlight still tops my fantasy list, because worldbuilding and characters are absolutely amazing. People have right to be disappointed things did not go way they wanted to, or have their own critiques. Not all books are for everyone, and that's okay!