Why small creature's are usually better than big

Vs.

Hey all you newbies out there.  This is the reason why most big creatures suck.  The main reason is the cost or the drawback.  Of course a 12/12 can just whomp on a measly 2/2 but what does it take to get the 12/12 out?  A whole load of mana, or even your whole hand.  They may seem good because they are beefy, but they are really just as bad as 2/2's.  Once you get the 12/12 into play, the 2/2 would probably deal as much or more damage as the 12/12 would deal.  Sure it's fun to beat an opponent up with a 10/10 or 11/11, but it's not worth it.  Play with hordes of weenies,  that's even more fun.