I go back and forth on this, because in the end the buck stops with the coaches. The offense looks out of sync at times, and Patricia's job goes beyond just calling the plays on game day. If he is the de facto OC, he's also responsible for overseeing the play design, and making sure that players understand their assignments within that play before they take the field (obviously funneled through the position coaches, and with Bill hovering around as well).
But there are two reasons I give Patricia a bit of a pass, at least early in the season:
1) It does feel like the biggest problem is turnovers, and those turnovers have happened either because of bad reads or straight up not taking care of the ball (like Agholor's fumbles). Again, ultimately, Patricia is responsible for making sure those things don't happen, but I want to see how well things improve in that regard, as it's not always as simple as getting it perfect the first time.
2) There really weren't many sure fire OC's just waiting on the market for them to bring in to replace McDaniels. The two we heard about the most were O'Brien (which in hindsight, it didn't seem like there was two way interest there, at least for this season) and Adam Gase, who I doubt anyone would have been very excited for. The other alternative was promoting Calley, but there's no guarantee he's ready for that yet, or promoting Mick Lombardi (if he was interested) instead of letting McDaniels take him as his OC. But it's not like that duo is tearing it up in LV right now either.
Patricia needs to be better (as does the whole offense) especially now that he's gotta work with a career journeyman under center. But I don't think the struggles have been all his fault.