So just recently I got back into SimCity, and knowing much more than when I last played it, in 2015, I can tell that there are major bugs that affect gameplay quite a bit. I don't know if there is work on a big community patch making the game more playable, as it currently is really frustrating if you want to build a successful city/region.
These are issues that occured to me while playing the last 5 days:
I built the arcology and only about 10% of the promised workers and customers are actually commuting
Citizens are abandoning their houses because they need a job, when in their whealth therer are about 1,000 free jobs
Continuous sound of planes flying by, wich can be annoying
Trams getting stuck on the street
Students not attending the universty, when the traffic is low and there are bus stops everywhere
Resources not being delivered to the great work, when applying for it
Techleven not increasing even when the university is placed directly next to it
Just these bugs make the game really hard to love, so I hope that there are modders out ther interested in working on a fix.