Chase distance for aggro'ed mobs is too large?

Hello, I was just wondering if the chase distance for aggro mobs is normal. For instance, I found that many mobs around silvermoon/ruins of silvermoon chase you for about 75 yards. This makes being a caster very difficult as you can't retreat without pulling another mob for a large distance. I asked around in general chat and some people agree and some disagree about seeing this problem.

I've never played retail so I just want to ask, is this how it is supposed to be? I couldn't find it on the bugtracker and am not allowed to post there yet.

Cheers and loving everything else so far.