The roster isn't "really good." But it's a helluva lot better than many here are saying, and yes, with a proper NFL QB (competent, not GOAT-level), they're still very much in the playoff hunt, and would be 3-1 in the division.
When the QB is leaving points on the board over and over again, and worse - giving TDs to the pther team on a regular basis - you're cooked.
Defenses know Jones. They know he can't throw to the sideline, or deep. Just like with Cam, they clog the middle, load the box, and call it a day. And STILL, with just a few bonehead plays taken back, they're still in the hunt.
It's not all on Mac Jones, of course. The Pats WRs are a bunch of 2s, 3s, and 4s. Their OL is young and has barely played together.
And still, the team SHOULD BE at or near .500.