Yep, that's exactly what I said. Great job summarizing my post. I couldn't have done it better myself. Truly, bravo.
You're zeroing in on too many little details, while not giving him credit for a bunch of other small things he does well. I don't think that's fair. It just shows you don't like the player. That's fine and fair. But to not go through a fair analysis of him isn't, imo.
Yes, he doesn't have the best IQ or vision. Yes, the accuracy of his shot hasn't improved much since he entered the league. No, he doesn't always get hemmed in his zone. No, it isn't always his fault if he IS hemmed in his zone. I'd say he uses his size and speed in an average manner. Doesn't use it the best way he can, like Karlsson for example. But not everyone is King Karl. He still uses his size and speed well enough to push forwards off the puck, to lead rushes out of his zone. Admittedly, those rushes often finish by dump-ins or neutral zone play and not in an offensive zone chance, but that's when expectations should come into play. Just the fact that he can singlehandedly get the puck out of the zone, multiple times a game, is a seriously underselled part of his game.
Now, I just treated some of the criticism you stated. Know that overall I think he's a 4 dman right now. So it's not like our opinions are that different. I think that right now if he had a dman who can carry a 2nd pair with him (like we thought Phaneuf was the first few months he was here, or in the mold of Bouwmeester/Brodin/Hjalmarsson/Dekeyser/etc.) he would look much better. He looks worse than he is because he is paired with the 5-6 dmen that you mention. He isn't one himself. Notice that when he's with Chabot those two look pretty good together, though with some gaffes which are to be expected.
If he was smarter, more aware, had more vision, used his shot better and his assets better like you seem to expect of him, he would be a #1-2 dman lol... So imo it's really unfair to use hyperbole and say that he's a 5-6 dman because he's not perfect in those things. Even Karlsson isn't perfect in his decision making and he's still the best dman in the league bar-none. That's just my (long) opinion on Ceci. It's fine if you have another one. Just trying to see if I can reason with you a bit.