I've noticed, some guys can write and draw pretty well.
John Byrne- Both his writing and art on Fantastic Four is legendary.
Walt Simonson- His run on Thor, like John Byrne's FF, is a masterpiece.
Frank Miller-his works on Batman and Daredevil is stellarly awesome as well.
Jim Starlin- he is greater at writing than at penciling.
Dave Gibbons- I enjoyed his works on Star Wars and Rann-Thanagar War
Erik Larsen- I loved his co-work with Busiek on the Defenders.
Jerry Ordway- His works on Power of Shazam and Avengers were good.
Dan Jurgens- His Superman run is quite enjoyable to read.
However, not many comic book artists can write good stories to my knowledge. And Rob Liefeld is no exception.
Based on what I've seen of Heroes Reborn, Rob Liefeld's writing style is horrible. Jim Lee's writing on Fantastic Four and iron Man is decent at best. I've seen only a couple of Todd MFarlane's Spawn issues which I borrowed from a friend so I can't make an opinion based on a couple issues.