Just finished all of them, and if you're not into the story, then you're out of luck. They get better as the 5 episode series goes along, and given that I'm a pretty crappy logic player, I tend to trial/error the solutions out, and get stuck a lot of the time, I still took about 6 hours per episode on average, and had a complete blast doing so. If they just made a cinematic of the series on DVD to watch, I'd kick back to watch it monthly, but I don't think you'd have the same investment and feeling of accomplishment at the end.
Overall though, being that they are the Tales of Monkey Island, I can't imagine how any self respecting MI fan could pass them up. The ending is just as outstanding as the rest of the series.