Short answer below:
DL is very solid, no issues there.
ILBs also solid, no issues there.
OLBs are... decent... sometimes good, but not consistent in getting pressure. Getting better at run stoppage ( even Haralson
Whitner's been inconsistent, but I don't regard him as a big "hole". Needs to play more disciplined, but so far, not hating his play.
Williams has been disappointing in coverage... looked good in pre-season, but not so much in regular season action.
Reggie Smith is a liability until 100%, and even then, is questionable on talent. Who knows for sure about Goldson yet.
CB play has really not been that bad, but again, I think scheme has been hurting their cause. Lots of soft coverage and zone has not brought out the best in them.
OL is a mess... no strength from Staley or Goodwin for the run game. Staley still gets beat too frequently on edge rushes. Goodwin has been dreadful at keeping his DT in front of him, and often gets pushed backwards in the pocket. Rachal and Davis often do their jobs in the run game, but it's a mixed bag there. The two have been pass protecting better, but Rachal is not quite keeping up with his good pre-season pass pro. Iupati has been overall good, but suffers from poor OL play on each side of him. Stacked boxes and heavy blitzes haven't helped any of them, but our play-calling isn't where it needs to be yet.
QB play has been good, but not perfect. A few errant throws here and there, but all QBs do this. Conservative play-calls attribute much here.
Gore runs hard, but occasionally misses his holes or run direction. On rare occasions, he goes his own way... as if he doesn't trust his blockers.
FB play sucks as usual with Norris. he occasionally gets a good lead block, but more often fails completely to be anything more than another impediment for Gore.
Receiver play has been... spotty... injuries haven't helped. Still waiting for more great plays like the one Kyle W made. Other teams constantly have receivers making fantastic catches. Our guys? Seem to need perfect passes.
Mostly, the conservative play-calling and the OL blocking is our issue here. Probably one because of the other.
The holes right now?
(particularly LT and C)
2. Our FS
situation is lacking.
3. Definitely could use Spencer back as # 2 CB
5. Without Braylon and Crabtree, we don't have real quality at WR