I'm an old fart when it comes to gaming and not at all n00bish when it comes to huge amounts of cheesy character builds in my gaming group. Problem is that, in order to create an interest in Pathfinder for my group (who are also old farts and don't generally like new game systems), I have to make sure that the cheese doesn't get out of hand so the adventure remains challenging and, thus, interesting. It's a vicious cycle; I run a new game to create interest in it so hopefully I can play, my group brings in cheesy character builds that totally ruin the experience and challenge, they lose interest, no one wants to play anymore. Rinse/repeat.
I need to nip this in the bud. I have no problem using my veto power as a GM but I don't know what to look for in terms of cheese. So my question is what are some of the cheesier/broken character builds that might threaten game balance to look out for so I can avoid this problem?