Aggression vs Caution

[thanatos]

I'm noticing that a lot of the LNOE scenarios seem to be built on a very precarious balance between aggression and caution on the hero side. It seems like, as heroes press the attack more and rush to complete objectives, they stand a greater chance of securing the victory, but as they get nervous about losing and move more cautiously, they stand a greater risk of losing either by time-out or from being overwhelmed by zombies.

I'm curious if this is just unique to my group or if others have noticed this trend?

Some scenarios even seem to be custom-tailored to exploiting a player's cautious tendencies, such as Burn It To The Ground. We played this scenario last night, and I secured a victory for Zombie-kind by getting my heroes just a tad too gunshy so that, rather than keep a hero positioned to exploit zombie hunger and protect a building that was almost fully occupied, the players had a very brief lapse in judgment and moved out of range to try to heal up, giving me just enough time to slip the last two zombies into the last building.

Back to my curiosity, has anyone noticed a more cautious approach actually paying off for their heroes, or do my observations tend to hold true across the board?