Looking beyond the conventional stats doesn't help matters. Williams has two hits and nine hurries, according to ProFootballFocus. The website's defensive end rankings have him ranked No. 39 out of a possible 59.
Williams might be feeling the pressure of his nearly $100 million contract. Once pressed on the issue, he said his sore left wrist isn't helping.
"I'm a hands-on player and it's all about power in my game," Williams said, via the Rochester Democrat and Chronicle. "It's just been a little odd having a little nick or whatever and not being able to use it to the full extent, but you know, you gotta play. When you're out there on Sunday, you gotta play regardless of what's going on."
Williams is having trouble shedding blocks, especially on running plays, he said it's "kind of frustrating."
Bills fans surely feel the same about Williams and the defense in general. The Bills gave up 45 second-half points to the New England Patriots last week. Kyle Williams has played great, but the rest of Buffalo's vaunted defensive line has been one of the disappointments of this young season.
We're not sure Mario Williams really is that different of a guy than he was with the Houston Texans. He was very streaky there and not necessarily a great player against the run. The Bills just have to hope a hot streak is coming soon.
Follow Gregg Rosenthal on Twitter @greggrosenthal.