This episode is soooo close to being great. The all too human and quick love affair is its downside. As soon as we get to Spock and the commander making gooey eyes at each other in her quarters, the episode drags. I like the Kirk goes crazy act to get the Commander to have some trust in Spock. But the "Kirk goes nuts! Kirk is killed by Spock! Kirk gets pointy and goes back!" is a little convoluted without having a better reason for Kirk being the person to sneak back aboard other than Shatner is the lead hero. He didn't get a tour on his way to their brig, so he didn't know where to go. He should be back on the Enterprise getting ready to execute some grand "Kirk" escape plan. Spock should have been the one to steal the cloak instead of just being some weird pointless distraction for the female commander. He already looks like them, so he should have pinched the commander as they did their thing, got into a Romulan uniform and made the disconnection. Then just as he gets it loose, he's caught by Tal and the commander. He quickly places his communicator on the device and the Enterprise beams it off, leaving Spock behind. Then the rest of the episode plays out pretty much the same.
I'm sure Shatner would have had none of that, but it would have made for a better episode and a hell of a choice to open the season.