Just to clear up some stuff mentioned above:
1) The "Trying to fetch..." is a SAB bug. It has nothing to do with specific providers, it is a generic SAB problem. It is supposedly fixed in 0.5.3RC1. For earlier versions the workaround is to restart your SAB with those entries still in the queue and they should start downloading.
2) There is no reason that NZBMatrix needs to be used direct to SAB (at least none that I know of). It should work fine with black hole. The only provider that has a limitation is Bin-Req - it MUST use black hole. This is because of a different SAB bug which shypike also said would be fixed in 0.5.3 (unrelated to the bug above).
3) Sick Beard requires tvshow.nfo files, it must have one for every show. This is a limitation that will go away soon (
http://code.google.com/p/sickbeard/issues/detail?id=184). The tvshow.nfo file is not related at all to the metadata setting, it is needed regardless. If you want SB to "look nice" all you need to do is to leave a folder.jpg in each folder, the per-episode tbn/nfos are not required in any way by SB.
Snatched means it downloaded the NZB and is waiting for your client to download the actual file.