First persion shooters problem

1. i cant see my own shadow.
   if enemy can see your shadow on wall he easly can kill you and you think what a cheater.

2. no legs.
   if you can see your own legs i feel like a ghost whit arms.

3.small weapon?
sometimes if you get closely to a wall or a person you will see your weapon get through him or can of beer is bigger then your RPG.

i dont know reason why they make moast popular or new games so unrealistic. But some games are realistic like crysis , F.E.A.R , mirrors ages , alien vs predator 3 (2010) and some other games coming soon or already are.

sorry for my bad english if i write some mastakes and this is my first forum topic/post so you know first time is not the best.