What we are seeing is frustration. When teams lose, you will hear a lot of chirping. Let's look at some facts.
In 2017, UConn football had more talent and had more experience than they do in 2018. Look at the 2 deep to start the season last year. No defensive starters returned in 2018. Three, Britton, Lawley, and McAllister could have played one more year, but left. They may have helped the defense, but UConn still would have lost 8 starters. Unfortunately, in hindsight, the talent and experience was not there on the roster for the defense to improve in 2018, although I think it shouldn't be as bad as it is.
On the current roster, there are 5 R-Sr and Srs that were recruited as freshmen. 5! That is totally unheard of in college football. As for R-Jrs and Jrs on the roster, only 11 were recruited as freshman. UConn has 16 recruited as freshmen Juniors and Seniors on the roster! Since UConn is a development program in which players have to be developed over time to be competitive, these are disastrous numbers.
As for playing favorites, first Newsome. In last year's offense, Newsome was very effective as a receiver with 25 catches and averaging 21.6 yards per catch. He ended up 2nd on the team in receiving yards. His rushing was down last year and he averaged 3.9 yards per carry. In my opinion, Newsome was a very effective offensive player, but Mensah brought something to the table as well. Having both Mensah and Newsome share the load was probably the best option for the offense, and Mensah averaged 4.5 yard per carry. I don't think favoritism played a role in playing Mensah.
And, look at the QB situation last year. Lashlee and Edsall picked Pindell to start the season, but it was pretty clear that Shirreffs, a Diaco holdover, was the better QB, so they switched to him. In other words, the best player played.
Unfortunately, Edsall inherited a mess and equally unfortunate, he is not an effective communicator.