ill address two things straight away and i feel like it's how most people on these boards and br.com felt:
1) flacco did not play well enough last year for a number of reasons - maybe the injury affected him still (quite likely), maybe the lack of oline help affected him, maybe his mechanics werent good enough and maybe he wasnt making good enough reads - half of those things flacco cant help and may even affect the other two things
2) flacco didnt play well enough last year and probably the year before as well (pre-injury) which i think comes down to 2 things... the mechanics and the reads - his mechanics have been off and ill give him the excuse that maybe the knee injury put him off in terms of being able to get comfortable and have better footwork but he looks wooden at the moment and nervous to step up in the pocket partly that's seeing ghosts from bad oline play and partly just bad footwork - the 2nd problem is the bad reads and sometimes missing the open man which can also partly be attributed to the bad oline play and rushing his reads and not letting routes develop, partly lacking chemistry with receivers and partly just not maybe understanding the trestman/morninwehg offence as well as he should
my point overall is that flacco played badly but not badly enough that he should be considered non-viable as a long-term option and that a number of factors contributed to his poor play - some which he could have improved himself and some which were outside of his control
and here are some reasons to feel positively about flacco (not necessarily the offense as a whole) - he is an extra year removed from the injury and definitely improved towards the end of the year (e.g. miami, pittsburgh on christmas day), he has a whole offseason to work on his conditioning and his mechanics with morninwehg before he even gets to training camp, the offensive system is moving to a power system which suits the offense a little better which should hopefully give flacco some relief: yanda will be healthy and stanley will be a year older in the system and he looked incredible towards the end of the season
despite the oline losses and lack of wr additions there are a multitude of reasons to believe flacco will be better
any talk of getting rid of flacco before 2019/2020 is stupid because it's financially unfeasible and any talk of benching him at this point is also stupid because he's shown himself to be a franchise qb able to win a superbowl which not many qbs with better supporting casts have been able to do (case in point... alex smith, any texans qb, tannehill, dalton (not even one playoff game), ryan (harsh i suppose), rivers, romo)
so i agree that flacco needs to improve but i disagree with the idea that he is unable to or is just garbage and i disagree that there were no mitigating factors to his bad play