BBT - Solid episode. Obviously the season will focus on wedding plans and pregnancy, which are tried and true sitcom themes from way back, easy to recycle. Longer term Raj joins Stuart as an out-of-place character with everybody else married off. It also cuts down on what all Chuck Lorre sitcoms reduce themselves too, with is sex, with all married, or pathetic loaner, characters.
YS - At least from the cast listings, there are no "regular" students as stars. Just the family. The interesting change from the main show is making Sheldon close to his mother, but that is realistic for a little kid, and the softening of the father's character, who in "canon" is a never around alcoholic who is destined to die in season 5. I still do not see how you make a series out of this week after week.
Side note, I realize the Coopers are supposed to be lower middle class to poor, and would thus drive older cars, but the cars featured are a tad old for the supposed time period. If we assume the character Sheldon is the same age as the actor playing him, it is supposed to be the mid-80s.