I don't understand the hate, personally. I don't think the vocals are the best, but musically? They're talented and pretty catchy. You can tell they put a lot of thought into their songwriting and have fun doing so, too.
There is nothing inherently talented about this band. By your assessment then Motley Crue must be the greatest band of all time because they definitely had a great fucking time making music
I implore you to please listen to better music