It's good to see a list of things you wanted (or did not want). Note that I'm not disagreeing with a lot of them. There are things I'd like to see done differently, too.
4x4 unrealistic gamebreaking issue (this is by far the worst issue in the game since it's almost the same as 1x1 SC4 buildings);
no zoneable landfill;
It's very artificial. From what I've seen, SC4 had very limited RC zoning but it had farms that could stretch way beyond that. SC13 had more flexible I zoning where large factories could spawn. I wish both were in CSL. Having larger RC buildings spawn would be nice - malls and such - but the emphasis here seems to be on custom assets.
oversaturated cartoonish graphics;
This is mostly due to colored lights at night. It's nowhere near as bad as SC13's futuristic buildings. On the other hand, SC4's graphics all look dated and grainy to me; most positive thing I could say about them is they're retro and that there are people who like that sort of thing. I respect that but don't care for it myself.
The soundtracks are too childish and similar to Simcity 2013, I'd rather leave them muted and play the SC4 mature sountracks in the background, at least it gives me the illusion I'm playing a serious game;
I think the music is not terrible, but it's a bit..."cutesy"...for my taste. And the winter music is way too loud!
locked buildings and roads at very early game in order to grab our hands and don't let us ruin our cities;
Start with the everything unlocked mod? It's built into the game.
that money when we are about to bankrupt a city and that money when we lvl the city up. Both are spit on our faces;
Hyperbole aside, seems to me some issues related to difficulty could be resolved with a hardcore mode.
They may be small, but you'll need a lot of them to support a large city. I usually end up building a dedicated service/supply area for the whole map, to simulate a big power plant (and big water, sewage, etc. processing facilities), so I guess I'd want larger service buildings, too.
no region gameplay as the guy above stated;
I like to build my cities as sparse or as dense as I wish at the time, over the full 25 tiles. I wouldn't play this game if it switched to a dumbed-down, cities-you-are-not-in-function-indefinitely, region system like in SC13. (also the graphics were really poor) Not sure how it worked in SC4.
no slums or poverty in C:S, only rich houses;
You can build slums with low land value buildings. The only practical reason for doing so is to support specialized industry compactly or very near the town proper (e.g. high density residential); otherwise, worker shortages appear as educated cims move into high-wealth residential buildings. Parks, upgraded roads, and some policies raise land value.
Are you referring to what was fixed in the recent update, or something else?
no upraisings or another disaster beyond fire;
Sadly, the only real "disaster" in this game is pop loss, due to mismanagement of the city. However, in SC disasters are usually (or always?) optional and off by default. I would like to see this added (as an option)...
it's impossible to build a true skyline without resorting on mods;
There are a lot of unique buildings/monuments, but they have...very weird...prerequisites to say the least. I don't like that at all. I've heard SC4 without mods is rather spartan.
...a mere city painter aimed for casual 9 years old kids...
...CO cares much more about keeping the inferior casuals accomodated with the lack of depth...
...If there is a group of inferior insects to blame for ruining something that should be awesome, they are the casual wasps, they are always ruining everything that hardcore players makes famous.
So you want your opinions respected, but you don't respect others' opinions?