I think it's fine and good that it "doesn't feel like Somerville" - it's positive when a city gets large enough to develop unique neighborhoods that feel different. What isn't good is how cut off the neighborhood is to it's neighbors. The path along the river to Sullivan is going to really help, I think, but we need better and especially MORE ways to get across the highway. Kensington is dilapidated but that's kind of whatever. The traffic problems are more critical (In my experience, drivers don't expect a pedestrian on a highway on ramp, so they ignore the signals. You basically have to step into the roadway and wave your arms before they take you seriously).
The single highest priority thing I can think of is to make the lights at Kensington solid red rather than flashing red. Right now the cars are allowed to proceed through the flashing red when clear, but that clearly isn't working. Make it a solid red and hopefully driver behavior will improve. Easy, cheap change to make that I think would really help.
The second is to improve the pedestrian experience at Lombardi/Mystic at the southern end. You have a great sidewalk on the Assembly side, you have a great sidewalk on the highway underpass, but then you have a weird no-mans land right at the intersection where the space to wait to cross the street is half blocked by construction fencing and the pedestrian light/button is all messed up (I assume someone ran into it with a truck or construction equipment). Repainting this intersection and pulling the stop line back a few feet should be another super easy, super high priority fix. That intersection also has terrible driver behavior (pop quiz, how many lanes does Mystic have? Whatever you just answered, it's wrong sometimes because the drivers form different numbers of lanes at different times of day) and honestly some paint to make it clear what lanes are for what and where to stop for the intersection would really help.
Both of those fixes are just light timings and paint and should be done yesterday.
After that the projects get expensive:
- A pedestrian overpass over 28 to connect to Ten Hills (You might think "why is Ten Hills connection critical? Isn't that just a kind-of-smallish residential neighborhood?" but look up where the public school for Assembly kids is)
- The footbridge over the river
- Another way to get under 93, from somewhere in the Vermont Ave area (I told you these projects get expensive). Personally I think we should just connect vermont ave to revolution (like, with a whole dang street you can drive through) but that's well into crazy territory.
Off the three expensive projects, I think the Ten Hills connection is the most critical (again, the school) and the cheapest to build.