What are the main arguments against Picasso not being a great artist?

For the record, in my opinion he was a fantastic artist. He did it all! And at a high rate at that.

Don’t get me wrong his style isn’t something I’d collect, nor would I try to replicate or am even influenced from.

But I do appreciate his work ethic and what he brought to the table.

So those naysayers, what is it about Picasso that makes him not such a good artist in your opinion.