My opinion of this episode is probably very biased, as I'm also something of a Star Trek fan. I can't help myself - I just love the transporter, the Spock figurine, Sheldon's Gorn-infected dreams and numerous other references - and Leonard Nimoy, guest-starring as the voice of the Spock figurine, makes this one of the most notable episodes of the show in my book.
As fare as the other side of the episode goes - agreed that the subplot revolving around Raj's selective mutism/sexuality is overused, but here it's amusing enough. And I do love it when we get to see a skype conversation between Raj and his parents!
I am all for character centric episodes. Raj is a good character to poke fun at, but the "is he gay thing" is getting very tired. Let him have a date for the wedding ... please? Even let me get to use his Bologna. Though the gay girl friend sub-plot was definitely the best part of the whole episode. The Sheldon plot line was disappointing, but I am not sure why. I did not miss Amy either. The Wiggly Finger Catalyst was a much better Raj Episode.The best episode this season for me remains the Halloween Episode.
Finally! Not laugh out loud funny like the best episodes of the first couple of series, but actually amusing, with good interplay with all the characters. I wonder what the mystery factor could be - why this one was so much better than the others? Hmm... 19 episodes with Amy, all flat; 1 episode without Amy, best episode of the series by far. No, can't quite see it, but I'm sure it will come to me.