The fact remains, no matter how much anybody bitches and moans about Devour, it will still be there. Sure it is a major annoyance to be devoured overe and over again, but it is one of the only things the Kharaa can do to make their end game win more entertaining. Just like marines can go build up mini-forts and seige farms as mentioned before, the Kharaa are allowed to get in a bunch of Devours.
And hey, if someone goes and rambos off, its their own fault when they get Devoured.