No, it was very easy NOT in hindsight to say selling him was a bad move, thats why everyone said it, before you sold him
As for not signing a contract, well, thats what happens when you have a quality player who deserves to start every game and you play a complete bag of crap every game instead. Barry for De Jong.... lol.
I think most people think there has been no obvious improvement in the squad, potentially some improvement in the back up but that is about it.
A back four and Lescott + Kompany was both the best partnership and the best line up/formation City could put out, replacing a truly awful 4th choice CB, for a new 4th choice CB is a sideways move. The fact that Mancini is peeing around with the 4th choice CB in a back 3 and that is an improvement on if he was doing the same with Savic is neither here nor there, he shouldn't be doing it full stop.
If you took your best starting 11 from last year and improved that would be, replacing Barry with someone better... he didn't, replacing Milner with someone better... potentially if Garcia improves you could say he did but, not really, you don't need another defensively minded player, you needed an offensively minded player who just isn't poor defensively, not the other way around. Likewise I would have bought an out and out speed demon/winger because Silva + Nasri combo failed on so many occasions to bring about a real push from midfield to upfront. Those two playing wide weren't very capable of taking it from the half way line to a goal scoring chance, very poor at taking it from deep in your own half to a goal scoring chance when counter attacking, they are classic final third players and pressure makes both crumble.
Has City's first choice 11 improved, not at all, is SInclair better than Johnson, maybe, is Maicon a big improvement, nope, is Garcia a massive improvement on De Jong, nope, is the 4th choice CB, sure, but he should still be the 4th choice CB.
City's biggest problem is Mancini, he'll ruin the team chasing euro glory he simply isn't capable of, he might fluke it but desparate plans in a formation he can't organise or train players for just to try and turn around his poor Euro form is doing FAR more harm than good.
There isn't a player in the team who looks better than they did last year, while the entire back line looks worse, Hart had a truly exceptional game but looks worse overall, Yaya, Silva, Aguero, Nasri all look worse, Barry.... crap but even less fit and sharp than usual.