My rpg group is generally very good about 'playing well with others' and most of us lean towards story-gaming more than anything else. We have one member, though, who tends to be a pretty prototypical powergamer--needs to win every encounter, always has to be the most important character in the scene, etc, and will argue or dice-fudge until it's so. Since our campaign was ending and the old GM wanted to go back to being a PC for a while anyway, we came up with the clever idea to ask the powergamer to GM, on the grounds that he wouldn't have the same problems if he didn't 'own' a character.
Unfortunately, it turns out you can powergame as a GM. For example; In one of the first couple of sessions of an SR4 campaign, we ran up against a NPC with a monofilament whip who the GM later told us had initiative 22 and 3 initiative passes--a tall order for characters much more advanced than ours were at the time. The NPC naturally started to clean the floor with us (also no matter how well we rolled, we * cough * inexplicably always failed) until the players were becoming visibly irritated and we were on the verge of a TPK. At which point the NPC mysteriously stopped rolling well and suddenly mediocre rolls were enough to hit him.
All well and good--I understand that GMs sometimes slip up and accidentally overpower an encounter then have to fudge it, and that's cool. Also that sometimes encounters really are very hard, and characters do die, and that's part of the game. Except this has been the model for nearly all subsequent encounters (or tasks) in the campaign. Whether it's getting past a low-level bouncer or a corporate assassin, in the characters' area of expertise or completely new to them, the characters will fail miserably on anything but a critical success right up until the players become annoyed, at which point one or two successes on a roll are all that's needed to guarantee victory.
A couple of us have mentioned our frustrations to the GM privately, but he seems to take us asking him to balance encounters more as us requesting the game to be easier, whereas at the moment the game is both annoyingly difficult and annoyingly easy; you can never win right up until you can't lose.
Does anyone have any concrete things we could gently suggest to the GM that would allay these problems? Or are there things we could be doing as players to discourage this?