On DM fudging, I hate it tbh, but I see some valid reasons for it.
If players are very attatched to the narrrative, love their characters, and are oversensitive about failing, I'd see why the DM would want to fudge.
In my group however, we like fighting and often suceeding by a very small margin. Not being able to say for sure if it was our skills and luck that did it or DM intervention would put a serius dent in the enjoyment of the game for us.
For example, once we accidentally got into a fight with a great wyrm white dragon with class levels around lvl 12 or so, and we were trying to make a run for it. Wizard and psion DDoor-ed away, psywar was already dead, and me(druid) and the cleric decide to take off together (i was wildshaped in a Legendary Eagle carrying him). Dragon is following us, and realizing he flies faster, we have a qucik OOC chat and decide for the cleric to jump, and drink a potion of Gaseous Form right before he hits the ground. The ground is too faraway for the dragon to chase us both, so one of us will make it in any case. Dragon goes for cleric, and manages to charge him in the last round before he hits the ground. Since cleric has only about 20 hp left, and he hits him on a 2, we realise it's pretty much over for him. DM rolls...natural 1. Cleric gets away, cheering, celebrating etc.
Had that roll been made behind the screen, I think I would have labeled this story as 'lame DM fudge' as opposed to 'epic fun'.