Haynesworth played 21 snaps against the Jets on Sunday, mostly in sub packages, after missing the previous two contests due to a back issue.
Of the Cowboys, whom he faced twice a season during his tenure with the Redskins, he said, "Regardless of what you would think, they’re a really good team and Tony Romo’s a really good quarterback. He can be streaky sometimes but most of the time he’s on point. We just have to get after him.
"They never give up, that team is extremely good. You look at their record, they lost some tough games but the teams they beat are all top of their divisions right now. So I wouldn’t count the Cowboys out – I think they’re a really good team and they’ve taken to coach (Jason) Garrett.
"The whole team’s unpredictable. They can do a lot of things – you can’t just watch one game and say ‘this is what they’re going to do.’"
As for his own play, Haynesworth was asked about his role to this point.
"The more I play, the more familiar I can get. Coach is not going to rush anything and he wants me to get my feet under me so I can play well," he said, and intimated that physically he still isn't 100 percent.
"I feel ok. I’m still trying to shake some things or whatever. But as time goes, I’m feeling better and better and more comfortable in the whole scheme of things (and) what I’m doing."
Haynesworth also called himself a perfectionist on the field.
"I wouldn’t say I’m satisfied – if I’m not making every tackle, every sack, every pass defense, you know, I’m not satisfied. I’m ok with it but I want to definitely increase and get a lot better and I want them to see what I can do.
"Even ask my mom – doesn’t matter, I’ve had games when I was with the Titans I had three sacks, a couple of tackles for loss and things like that and she’s like ‘how’d you play? You played great.’ And I was like ‘yeah, I played ok.’ So I guess I will be. I want to be the best at what I do at all times, never want to slack. If I make a tackle for a one-yard gain, it should have been for a one-yard loss and if I make a sack, I think I should have had a sack, a strip and pick up the fumble."
How long until he feels he's at his best?
"Hey, only God knows that question," he said.