Well, what they are missing is mostly a matter of personal preference, but since you asked.
The first one I looked at was the Simplicity, there were a lot of things I liked about it, but it was missing mass. It gives up a couple hundred pounds to the JD & Kubota and it looks like it's all in the frame.
The next one I looked at was the
BX2230, the first thing I disliked were the hydro controls, I just don't like that rocker pedal, I want side by side pedals like the JD & Simplicity. The other thing is the hydraulics -- they appear to be an afterthought unlike the Simplicity which has the hydraulic control right next to the steering wheel where it belongs.
Next came a look at the MF 2300, which has a lot of the same problems as the Kubota, but didn't have the "fit and finish" of any of the others.
Most recently I looked at the Deere 2210, it has most of what I want but the long wide hood gives me some concerns about visibility. I did not get a chance to drive one since the only one they had was already sold.
I'm looking forward to getting a first hand look at the New Holland/CaseIH offering. Based on what I see on the New Holland web site, it may be just what I'm looking for.