I liked it. The shift between material worked for me. The humor wasn't over the top, it was in periods that Sam & Dean aren't expecting trouble and that felt very right.
I really enjoyed the focus on Dean's life. And I thought Jensen did a solid job here. The two best of those scenes are his confrontation of Ben and the final scenes with Lisa. But really all Dean's home scenes felt true to the character of Dean.
I liked the grocery store scenes, starting with the light banter (which felt like me and my brother the first time we watched a baby), the only slight quibble I had with this scene is that we don't see either brother try and hold the child, and even a novice knows to try that. Every thing else matched up to my own personal experiences as being completely inexperienced with very young children (heck my brother and I were teased about being a couple the first time we went out with his kid). I also liked the fact that at first the people were more agains the women stealing the kid, but once the scene shifted towards Dean with a women and a weapon how the other person automatically assumed the women to be the victim.
As for the Cambell's the only part that I don't get is Sam's reaction to them. Is open acceptance of them is strange. One you would think after being lied to by both Angels and Demons, having other hunters hunt him, ect that Sam would be a little less trusting of pretty much everyone.I can understand Sam cutting himself off from his emotions (very believable), but I don't see any reason why he would trust these people. Certainly after Ruby and the Angels he should now that he can't judge someone by their behaviors or by his expectations of what behaviors a group should have. Thats really the only part of this episode that had me going, that makes no sense whatsoever.
The opening teaser was also surprisingly void of suspense. THough I have said that multiple times when children are part of a scene Supernatural really down plays the actually violence not to mention the atmosphere (really the only exceptions to this have been Azazel and Sam and other kid, and the Shtriga (or however you spell it).
And as Startrekwatcher mentioned they seriously need to stop laying everything out in the "previously on" segment. This isn't something that new to the show, in fact it does go back to the first season, but still. You can always tell what creature is the bad guy by the opener. And seriously stop it.
I will say I actually didn't expect the creature to be mating with humans. We haven't had much of that on SN with any form of creature (the only thing I can think of was the Anitchrist, I actually can't think of another of the top of my head).
And of course we are going to get some car porn with Dean starting back up. Of which I am all for. We may rarely see them sex up Jensen and Jared, but the Impala is another story.
A few major/ minor quibbles/ questions.
Where is the colt? It can kill (if aimed at a kill shot, nearly everything). They still have it last I saw, and it appears that Ruby showed them how to make rounds for it, so.....
2nd where is Ruby's knife? And can it kill anything besides demons (I mean obviously it can kill anything a normal knife would), but have we ever scene it used on anything besides a Demon, An Angel, or a human?
Certainly the colt needs to be addressed.
Oh, this one's a B.