This could very well change in the coming season. Geno Atkins could return to form, Michael Johnson could be the Michael Johnson from 2013, Margus Hunt could show something, and the Bengals pass rush could improve on its' disastrous 2014 campaign. But right now, we're calling it a weakness.
Dwayne Bowe didn't catch a single touchdown in Kansas City, and he isn't going to revitalize his career in Cleveland. Brian Hartline is a solid receiver, but he's not going to scare any defenses, especially with his quarterback situation. Andrew Hawkins is a good receiver, but not a bonafide #1 option. Neither is any wide receiver on Clevelands roster.
The Browns have some good blocking tight ends, but none to replace the pass catching ability that Jordan Cameron provided.
Quarterback is not looking any better.
Josh McCown was only able to succeed when he was throwing to Pro Bowl receivers, something that Cleveland doesn't have.
Johnny Manziel looked completely overwhelmed in live action.
Connor Shaw is a career back-up at best.
The Steelers have some issues in the secondary right now. Cortez Allen and William Gay are currently the starting corners for the Steelers. Allen struggled during 2014 and lost his starting spot, and Gay is best used as a nickel corner. At Safety the Steelers have Mike Mitchell, who struggled in 2014, and they hope that Shamarko Thomas can step up and replace the retired Troy Polamalu. The Steelers will also likely be counting on at least one of their rookie defensive backs to make a contribution this season, which could be a lot to ask of them.