When I first played the game, I did so on Hardened mode, was not that hard really, and I felt it was a bit short and that perhaps levels were not as good as COD4, however, I have since played again on Regular to try to find the Intel, and am now 38.5% through on Veteran mode... Loving the SP.
The Special OPS levels are a mixed bag, some are straight out of the game levels but some are not, so Im liking it in general.
For those saying it feels like the levels are smaller or on rails compared to COD4... WTF!!! I see no difference in the size of complexeties at all...
In all it feels like a good successor to COD4
Still not played MP, I only have a 2mb ADSL with BT, so high pings are default and reading the post online suggest it would be an annoying lag fest, so may not bother, Im happy to continue playing the SP and Special OPS over and over till I get 100% on it ALL.
P.S. I reserve the right to give up at any point!!