Once we hit Act 5 and we find out what all the fuss has been about, it’s a giant “say what?” All this trouble just to set up an invasion of Vulcan? Yes, having a toe-hold in the midst of Federation space would be a great coup for the Romulans, but the implementation of the plan depends on so many unpredictable factors, and so many factors out of Sela’s control, to work that it’s no surprise that it failed.
Plus, the most frustrating element, Sela leaving a brilliant android and one of the finest scientific minds in the Federation locked in a room with a holographic projector, and absolutely no security. No cameras, no microphones, no security scans, and most absurdly, no guards left in the room. Seriously, did Sela not read the Evil Overlord Rules?