It could be said that Beowulf is the archetypal epic hero - he has no apparent flaws and possesses superhuman strength and endurance.  In addition to this, he is greatly concerned with honor and glory - it is for this he quests.  Rather than fight his monstrous opponents with the help of others, he chooses to fight them alone, as his pride would be too injured were he to accept their aid.  Though such an obsession with honor is frowned upon in today's society, in Beowulf's time it was accepted and understandable.  There were few written texts, and so one's history mainly lived on through story alone.  I don't think Beowulf should be looked down upon for his quest for honor - he had little as a child, and so is very concerned with earning a good name for himself.  In the modern day, such behavior would be described as childish, prideful, and shallow.  Beowulf's society was one that praised generosity, loyalty, and bravery.  Ours is one that praises generosity, loyalty, and modesty.  Again, though, Beowulf's actions would have been seen as heroic and completely understandable - his fighting Grendel and his mother alone is much more memorable than if he had fought with a team of warriors.  We praise Beowulf for his great generosity and loyalty towards his comrades and king, and criticize him for taking pride in his deeds.  Why should we criticize him for choosing to fight the dragon alone instead of with an army, when if he'd brought an army, many warriors would die?  Even so, he realizes and acknowledges his declining physical ability and brings a small group of warriors with him.  Beowulf should not be criticized for knowing his own limits and acting accordingly.