Annoying lead characters

I thought the film was a very good effort. Nice to see some new effects and sci-fi has been far and few between in the last 10 years due to their sizeable budgets, so this definitely scratches an inch.... however What was going on with the scientist couple? I've never heard of them (actors), their characters were so god damn annoying and this left me thinking... the caster should be shot. Charlize is an amazing actor, why the hell have her play some cold fish while the leading female 'scientist' just plain ain't up for this type of greatness. Such a waste. Why oh why was everyone so gun ho and clueless? Realism in decision making was poor to non-existent. Should have sent the SAS. Totally worth seeing though in my opinion... but Aliens remains no1 following by AVP IMO.