I really didn't like this episode. There was only one plot thread that had actual promise, and even it wasn't great. Let's take a look.
Penny and Leonard's plot involved them going out to dinner for Valentine's Day. When the wait at the restaurant is too long, Penny tires to flirt with the Maitre D' to get a table, but he calls her "ma'am," causing her to have a crisis about her age. Leonard and Penny decide they have to do something fun and young, so they end up dressing up in weird Valentine's Day cupid outfits and throwing confetti around in Sheldon's apartment. This plot thread wasn't fun or original in any way. So Penny is upset because somebody called her "ma'am." That's not necessarily a sign that you're getting old... and their weird way of being "young" was to cause a mess in Sheldon's apartment? I just didn't get what was funny about that.
Meanwhile, Raj finally decides to break up with Emily. He has been wondering if he should do it for a while now, and he finally pulls the plug. He then calls Claire and asks her out, only to discover that she's just gotten back together with her boyfriend. Raj goes to Emily and begs her to take him back, but she says no. Raj then calls Sheldon and Amy on their live edition of "Fun with Flags" and talks about how lonely he is. This plot thread is really not endearing me to Raj. He dumps Emily because she's not right for him - okay, fair enough. But then when he finds out that Claire isn't available, he rushes back to Emily because he's afraid of being alone. I can understand that. But what I don't like is the implication that Raj only sees women as either datable objects, or the spouses/girlfriends of his friends. He seems to be unable to imagine that women might be valuable for friendship. His weird insistence on forming romantic connections with everybody is rather unsettling.