What's the problem at Bethesda?

All three of those games are the largest mapped games ever made if you haven't noticed. the amount of time it would take to make a game like these perfect in every way would take 5 years to complete and by then it'd be obsolete. Every jagged rock in the games needs to match EXACTLY with the next textured environment for it to be good. when this doesn't match 100% that tiny gap between the items can cause your gun/sword to fall through the map when you drop it. or shoot your character into the air randomly. As for the lagging, their eyes are bigger than their abilities right now. They make you a game that is so big and has so much going on (such as a dropped item always being there when you go back to it) that the systems just cant handle it all yet. And for movement imagine if your character started out as a stick man. the movements would be simple in retrospect. Now add layers on top of layers of texture and detail and your stickman just became as detailed as the Mona Lisa.

You're wondering why there are problems when you should be asking why there aren't more problems. So far my biggest Skyrim problem was when you help a woman escape from a cave and she gets stuck at the entrance. She gets stuck because she keeps running into a jagged wall. The developers messed up on that character by getting one detail slightly wrong. Think of it as misplacing one letter in one word in the whole dictionary. That one minor detail causes her foot to hit the surface of the wall causing a glitch that many people complain about.

So when you look at it all as one large world of detail they did phenomenally on all 4 games. The fact is there's just too much detail to get it all right the first time through.

That is a pretty general statement. I've been playing Skyrim on an Xbox 360 nearly every day since the game came out and I haven't experienced any serious bugs. It's an older Xbox 360 too.

While I appreciate that many people have had problems don't overgeneralize. You hear more from the people who have complaints. As so many more people play and problems are discovered Bethesda tries to address them.

The complexity of the game is bound to cause some issues because the game allows people such freedom to do things so many ways and in no particular order.

Think about the small details. If you drop and item on Skyrim, the game has to remember the exact location and position of that item. That alone takes a hell of a lot of precision in a game, not to mention the fact that the map is HUGE. The freedom of it just takes up a lot of time and energy to create, so glitches are basically inevitable. Bethesda are always looking for a way to patch the problems and perfect the game.