Seems pretty decent; emphasis on utilizing the bike trails/MUPs for the main part of the route. Not an issue but it probably won't be of much use to people who take side or main roads primarily. Good for beginners though.
I've been playing around with a few of my old commutes when I lived in the city. Find it very weird that they actually direct you away from Oak to get to downtown. That's one of the most popular (Bryden as well) E-W routes I hear people recommend and have recommended myself.
Overall seems like a half-decent tool to get some idea of where to go. Some of the route selections seem goofy, like the Oak St thing or taking High over Front. Those are just my personal choices though.
Although I am a bit biased, probably the best tool to find a route is going here and asking people who actually cycle in and around Columbus for route advice.
Dublin and Westerville both have pretty good trail systems. There is a group working to build a Westerville to Arena District trail to facilitate commuting. The problem with most of our suburban cities is that they support very good park to park, off road trails that are great for recreation.
They just don't offer a great connection to the surrounding region that can make bike travel that much more accessible and useful. Columbus may not seem bike friendly, at first glance, but the interconnected secondary roads throughout most of the city and the extensive trails make for a pretty good combination to access most of the city and even parts beyond. Over time, the emphasis will be greater regional connectivity. I know the Alum Creek Trail is getting closer to completion, eventually providing access from Groveport to Easton to Westerville. Eventually Goveport south to Canal Winchester and east to Reynoldsburg.