Rams' biggest problem was their terrible offensive staff that were not on the same page, gameplanned at a "high school" level, and who led/allowed Fish to think they could actually contend with a backup QB. This looks to have been fixed with the addition of a young offensive mind who is very dynamic and who seems to be a natural leader given the quality of the staff he has assembled.
Their next biggest problem was an OL that couldn't run or pass block. While I think some of their problems were due to the above, fact is LT was a turnstile, C got overpowered, RT looked like he was playing on one leg, and everyone else took their turns making mistakes. I honestly can't recall a line as bad as last year's, gotta go back to some of our worst seasons and it's close even then. Not going to say it's fixed, however we have gone from a pile of feces to above average at LT. The line has been significantly upgraded on that alone, and if they can find a starting Center in this draft it might come together this year pretty well.
Third biggest problem was a mix of QB and pass catchers. This was of course affected by the first and second issues, but the nice thing here is that the QB position has legitimate starting talent. Goff has to have a statement second season, and if he does things look great for us. If not, it's a rebuild. WR and TE is the same deal, with unproven talent that will need to step up for us to win.
So IMO we've gone from a team that didn't have a chance due to critical offensive shortfalls to a team that has a chance to grow into something worth watching. That's a pretty good offseason and when you look at the addition of Phillips as DC it's hard to find another team who has improved as much as the Rams have. On paper of course, so for those who are paranoid they have good reason to be. But I'm pretty stoked right now and can't wait for the draft.