Really? Ok so we played it right and just got lucky with the Mine launcher weapon then? Don't get me wrong we still only scraped through but it just seemed as though there was never a reason to actually fight any of them.
We have house rules around certain things though to make it more intense. Like we have a rule that says that if you find survivor cards you have to play them straight away to increase the burden.
And last night we played that we had to use the pills straight away too.
Even though you never 'have' to fight them you may need to. If they get placed in a location that you need to search you will eventually need to fight them. Also if you have multiples out you'll need to kill at least one because the locations will start to get over run and you don't want to keep everyone at the colony.