Hard to fault him too much for that. Famous painters have regularly done that, hence all the "School of X" paintings.
His paintings were definitely emotional and lowbrow. That does not necessarily mean they were bad. I read a piece of serious criticism of his work a year or so ago (from NRO?). Conclusion was that his early stuff was very good, but he got lazy and sloppy over the years.
The pictures all look like greeting card illustrations. Nothing could be worse