The biggest problem with the spawning for me was that it was so out of place as to be jarring and removed you from the experience. I don't expect "realism" in a game with magic and dragons but any time something inexplicably goofy happens it lessens the experience for me. It would be different if spawning baddies were part of the canon (like mages using teleport spells for instance) but it wasn't. I agree it was sloppy and lazy, like most everything else about the game, but for me it was only a small annoyance compared to the much more unforgivable affronts of DA2.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.”
- Mahatma Gandhi