I guess I just got lucky cause I have a good friend who plays a warrior, he was always about 10-15 levels ahead of me, and ran me through every dungeon when I came to them. On the flip side, I have about 7-8 years mmo experience, and although I do consider my self to be a casual as I only have about 3-4 hours a day to play, for me most of these dungeons we pretty easy to figure out what to do with minimal explanation.
I have cleared up through Prea and the only dungeons I watched videos for were Cutters Cry only because everyone said it was the first hard dungeon, I watched a video for cape westpoint only cause it was my first 8 man, and also for Garuda just cause shes a little more complicated. I have yet to do AK and plan to watch the videos for that only cause I have heard it can also be challenging. I did DCimera the other day, I got into a group, went to watch the video, they pulled when I was like 30% through the guide, so I just followed what everyone else was doing, we wiped once on the first attempt, I died pretty early, and raped it on the next attempt with no deaths.
I look at it like this, if your a tank/healer, (and I have played as a tank during WotLK) you should probably at least read up alittle bit before attempting anything only cause your role is a little more crucial. As a DPS class, you can probably get by not reading up on the smaller dungeons. If you are attempting to do a raid, including Primal HM's, your a fool if you don't go check out a video, cause some things just can't be explained in party chat. Although, I don't know why people have to be soo rude to everyone, yeah after 5 wipes on the same boss where some clearly does not "get it" then yeah I understand, so just drop group, but jfc is it that hard to take 30 secs to explain something to someone. My favorite is Ifirit HM runs, where after one wipe cause a stun got resisited, eveyone just drops group, or the other day, a paladin missed a stun about 2 mins in, I watched a summoner just stand there and take the eruption, he called the tank a ******* noob and left. I guess some of us are just not perfect enough for the rest of the world
The players in DF don't necessarily know everything about the dungeons because they might be new. This is how we build a positive community: by assisting these players and imparting the knowledge we've gained upon them.
Also this, although I think some people are just to selfish to understand this.