I think end of seasons were fantastic, if the dungeoneer was only midway through the dungeon, such as series 3, for instance, and that bloody good ending with the trombone, and series 5, with the freezing objective. However, for those who were nearly there, they should have shortened the number of rooms down, or provided appropriate short-cuts for retriving objects.
This is the way that i see it - lets see who agrees
As a child(and i have mentioned this in other posts) I never really knew or cared that Knightmare was a Game show.
As far as i was concerned the dungeoneer was "killed" by whatever or however it was shown in the show(Eg: being eaten by ariadne) Although their failure in a previous part of the dungeon was usually mentioned as the cause it never occured to me that the team was going to lose from the point of this mistake onwards.
With the "Destroy the dungeon"series ends it was the same way i thougn the team were doing well untill the horn blew - "NOOOOO that team might have made it in the end" would have came to mind but t'was all part of the fun.
The sub quests at certain series end (eg:Freezing the dungeon) when completed also led me to believe that the dungeoneer had "won" as his new objective had been completed and the powers that be reigned supreme.
The game show aspect of Knightmare seems to only really appeal to those who are on the show. the rest of us can be content with sitting back and watching how simon's team were performing well untill they told him to "sidestep right" - their mistake may have been made at that point, or it may have been made earlier. apart from cases where object mischoice is made obvious (series3 team7) we will never know.