Whenever a game crashes I tend to consider just giving up on it altogether. Back when Battlefield 2 (yeah, 2) was out it kept crashing on my PC after about 20 to 40 minutes of play time and after not being able to figure out what the problem was I quit it altogether until I got a different PC that for whatever reason didn't suffer from the same problems.
Usually, if a game crashes on a consistent basis before an hour is up, I'd give up on it. Fallout: New Vegas was an exception; despite the random crashes I kept on playing it anyway, obsessively saving every few minutes. My friends tend to be really discouraged if their game crashes, because they're afraid of it happening at the worst possible times, or corrupting the game's data somehow. I kinda have that fear too, but if it's a game where I can save anytime, it's not that big of a deal unless it happens every few seconds or something.
What about you? How much crashing do you tolerate before you decide to just quit the game and never play it again?
In multiplayer games I always try to play stealthily and take routes most people wouldn't take. I like attacking other players from places they never expect. I spent a lot of time playing as the Spy on Team Fortress 2, and back in Battlefield 2 I always found ways to sneak into the enemy's HQ and then start planting bombs on vehicles before they get in, then detonate them once they're full.
When it comes to single player 4X strategy games, I tend to play peacefully and only fight when attacked. In story-driven games, I try to get every single backstory-relevant item. If there's a newspaper clipping or a note, I'll find it.
Azure Dreams. It wasn't reviled, but folks didn't consider it to be great fun. I enjoyed going up the Monster Tower and try to get to the top before running out of HP. Also, the town-building aspects were kinda cool. I liked how the money you got from dungeon crawling can actually help improve your hometown. Plus, I liked the monster designs.