The worst game I've ever been in was a Teenage Mutant Ninja Turtles and Other Strangeness (and no, it wasn't because it was a TMNT game, either!). I was playing a mutated Marten (it's a ferret - like creature, for those who don't know) who was a ninja. The ST decided that I was supposed to investigate this warehouse (I was the only player, and it was my first time with the system), so I did. Which wouldn't have been so bad, except for the 50 troops all armed with guns (I stayed true to my character and was armed with a katana, 6 shuriken, and a knife), a grenade launcher with attached motion detector, an armed boat (the warehouse was, appropriately, at the docks), and 2 Russian Hind helicopter gunships. Needless to say, my character died quickly - I had absolutely no chance from the outset.
And, yes, I was trying the stealth thing - but nobody, especially a starting character, succeeds in every single stealth roll.
jim