One thing that everyone needs to realize when writing about
Video Game "Cliches" is that many are just gameplay conventions.
Coming back "Invincible and transparent" gives you an opportunity to readjust yourself to the game and your current position.
And ammo appearing in odd places... it appears when it's helpful, usually. And I usually see it appear in places like crates and such. Or off of fallen enemies, which certainly makes sense to me. Games like Return to Castle Wolfenstein are starting to buck this trend by requiring a lieutenant to drop ammo or a medic to drop health.
Just remember, conventions and cliches are not the same thing. I work in theatre, i deal with conventions day in and day out.