Most people don't hide completely in the bushes, you should at least be able to see feet or something. Especially if you zoom in on them, you should be able to see some uniform or something. Moving slowly, and being very vigilant, the bushes aren't impossible.
On the other hand, the bushes are extremely good hiding spots. I'm not sure if they're unfair, but they're definitely tough to deal with, and do lend themselves to spawn camping very well.