Harriman's scene is not a cameo, walk-on part, where having an awkward actor in an ill-fitting uniform was necessary to make an immediate connection in audience's mind that he was inferior in Kirk's presence. But the director's using this made-for-T.V. mentality by casting the Harriman character thus, perhaps he was just disinterested in the assignment of GENERATIONS, or maybe he's just not that good. But Harriman didn't have to look like a spaz and act like a nervous nelly to showcase Kirk's ability to lead in an emergency situation. It's just this lazy, get-it-in-the-can quick and dirty mindset at work, here. And again, Harriman's a Captain, assigned STARFLEET's Flagship. Had he been more Decker-like, in casting and portrayal, and had the director been worthy of the project, the writing, such as it was, would've held up so much better. All this underscores, really, how a writer can be made to look good or bad, regardless of what's in the script. What's on the page isn't necessarily always on the stage.