I personally think Advanced Warfare is the worst, considering how unbalanced and annoying the multiplayer is. I also think the movement system is very unpolished and bumpy.
I think Infinite Warfare is the second worst because it's just a copy of Bo3, but in my opinion just more boring. Sure the supply drop system is better, but something about the game that I can't name just makes me feel uninterested whenever I play it.
I've never played ghosts but I heard it's pretty awful, so I put it on the pull. At least it's boots on the ground though. I would probably put it as the third worst, just from what I've heard.
Bo3 imo had the opportunity to be great, but the supply drop system held it back quite a bit. Other than the supply drops and the somewhat unbalanced multiplayer, I thought it was an okay game, so I would put it at the number four spot. I'm just happy MWR is out this year.
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Everything after mw3