you just proved my point right there. bioshock is a SHOOTER,so of course there is more action and "straight-forwardd runs". mass effect is a RPG so of course there is going to be slow talkin parts and more exploration. those both at the core of both genres
so if if someone was to pick it would strickly based on their preferences. people that prefer rpgs are going to pick mass effect. people that like action games are naturally going to pick bioshock
i PREFER mass effect,but that doesnt necessarily mean i think its better,i am just an RPG fan. bioshock is the best game to come out in 5 years,but i will still play mass effect before i play bioshock
its all about preference