There are so many different things going wrong in different games, but one thing that has been strikingly similar for couple of seasons now is the lack of talent and difference makers at a multitude of positions.
Here are the most evident: 1) We don't have a starting caliber WR outside of SSS. 2) We have virtually no pass rush now that Suggs and Doom are at the tail end of their careers and no successors in sight. 3) We don't have DBs, mainly we are missing adequate FS and 1st string CB. 4) We have 1,5 solid O-linemen in Yanda and maybe Stanley, if he can stay on the field.
The sad thing is, this list is getting longer and longer every season. SSS will probably be gone after this year. If we can't retain Brandon Williams and Jernigan in the coming offseasons (which will most likely happen), we don't have starters on D-line. Suggs and Doom should have been grooming their young talented successors already last year, instead we have no solution in sight. And if we botch another season and the injuries continue, I would not be surprised to see at least one of those guys retiring after this year.
We have drafted a plethora of young talented players with seemingly high ceilings, yet they seem to develop slowly and below par expectation wise. Think Elam, Brown, Gradkowski, Thompson, Jackson, Lewis-Moore, Brooks, Urban, Wagner, etc., who should have been the next young generation of difference makers. None of them has turned out to be a great starter in the NFL.
I do not know why this is so (bad coaching? bad drafting? lazy players?), but the fact of the matter is, our franchise players are getting old and losing their edge, while young guys aren't picking up the mantle. This can't be changed overnight and, unfortunately, if that trend won't change, we'll be in for many many loooong years to come with no winning record in sight.