"It is funny, but from watching the episode, I got the impression that the Marines were heavily outnumbered. In fact, there were 11,000 marines and only 900 Japanese..."
This is slightly out of content. Roughly 1 battalion of a regiment (Japanese) attacked what they thought was a small force (2 battalions of a Marine regiment with artillery support) in a very poorly concieved frontal assualt. They must have thought that the Marines were no match for them and attacked a prepared position across a water barrier without reconnaissance. This was the first of a series of mistakes that lead the common Japanese soldier to call the Canal "Death Island".

If you want a good fight and first rate WW2 propaganda watch "Guadalcanal Diary" or "Beach Red", where the Marines battle the "dirty rotton Nips..." Otherwise give "The Pacific" a chance. But IMHO, no movie/mini-series or teleplay can really give an truely accurate picture of a battle. The noise, the chaos, the smell, the fear can't be experienced second hand.