Jerusalem is a bad example, it's generally held in high regard and it tends to do well in Bruce survivors. It seems that recently people who don't really like it as much are coming out of the woodwork.
But there are definitely instances of songs sneaking into the top ten; it happens in just about every survivor. So many people are trying to protect their favorites, that at least one song that isn't particularly loved but also not a least favorite manages to find its way into the top ten. That song also usually gets eliminated first with a lot of people wondering what it was doing there in the first place. The most recent example I can think of is The Mirror in the Dream Theater survivor.