So I fought Alduin just now and encountered a couple annoying bugs...

1)During the cutscene where the screen turns red, after that girl says "Enough of this talk, Alduin approaches!", Alduin actually didn't approach them and just continued to fly around in the air as if he doesn't notice them. Had to reload the game.

2)After said cutscene and once you begin fighting him, often times he will just stop flying and sit there at a distance not doing anything. Casting Dragonrend on him does not make him land or move or anything. Attacking him with ranged attacks don't do anything either. Had to reload the frickin' saved game and HOPE he wouldn't do this before I could kill him.

It seems the Dragon flying in Skyrim is buggy. Several times in a dragon fight, the stupid dragon will just fly away in a bizzarre pattern and then eventually come back. One time, it didn't come back at all! I hope Bethesda is aware of this bug, because it's making fighting Dragons a pain in the ass.

So no one else has experienced this?

I can't speak for the other parts, but what do mean by this? Are you referring to the way they soar around? If they're not interested in you, they may just fly off somewhere else. I don't think it's a bug.

With them flying off or ignoring you, seen that too, annoying but not necessarily a bug. I'm the Dovahkiin here dammit, it's me you're supposed to be scorching!

Once I had a dragon land and just sit on the ground and do nothing, while I was slashing him to death. He eventually took to the air when he had no health left.

Never fought Alduin himself though.