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In one of the levels I found 2 rings called bone spear <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />; I couldn't find the entry to 3 underground dungeon in one of the levels; and in one of them, the 3 underground dungeon was completely empty (there was no one kill and nothing to pick up). <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />

In the battlefields, the dungeons, the monsters and the quests are randomly generated by the game.
So it is possible to find a great number of monsters in one dungon and no monster at all in another one.
For finding the entry of the dungeons, you can have a look at these maps made by gamebanshee or you can use the official strategy guide.
Battlefields


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I don't really blame the game testers for not being perfect about finding the bugs in BFs.

Yes don't blame the game testers. <img src="/ubbthreads/images/graemlins/badsmile2.gif" alt="" />
I was a game tester but i tested the beginning of act 2 not the battlefields.
A tester can find a few bugs but not all the bugs because he/her can play ten times a part of the game without finding a bug and at the eleventh time he/her can find bugs.

Barta