I've no opinion what-so-ever on multiplayer because I avoid competitive online MP like the black plague. So this does wear down by overall opinion on Halo 4. Though I have played all the Halo games (with the exception for Spartan Ops) on all difficulties and I don't understand what the problem is. It just seems the Halo 4 is a bit more unforgiving if you pull off a false move and you pay for it dearly. As for weapon balancing, it didn't feel that out of whack. Despite damage ration in comparison, accuracy with the forerunner weapons was a bit lacking by my feel which made up for their high damage output. However, in the hands of the AI, the weapons were... to say the least, devastating, though I think that was the point.
I just enjoy a fun challenge.
But as previously stated.
Brain out, into the fridge, enjoy self.
I suppose its because I never became a huge fan of the Halo series; I'm what some call a casual gamer. (except for simulation games, particularly Maxis) I don't have pro skills but I sure as hell know what I'm doing.
On a last note, I avoid competitive online MP because my introduction to it was CoD and... well, every other CMP-FPS I've played reflects the same poor tactics used by so-called gamer's who, in turn, abuse glitches and issues within the game code. I'm not sure if this same problem persists in Halo 4. Though I have played Halo: Reach MP and kicked some serious ass. Easier than hell, strangely enough.