Oz,
This person is certainly impassioned about MBA admissions.
A few speculative theories on why people are complaining about Columbia's admissions system:
One theory: The applicant believes that Columbia is beneath him. He applied to Columbia and failed to get the response he expected. Ergo, applicant expresses annoyance with Columbia admissions.
Second theory: Applicant is really interested in applying to "better" schools and views Columbia as a potential "safety" school. Applicant realizes that the admissions policies of Columbia complicate its use as a safety school. Thus, applicant expresses annoyance with Columbia admissions.
It should be noted that there are a number of reasons schools might want to increase their yield that have little to do with league table rankings. For instance, at virtually any institution it is valuable to have people who genuinely want to be there. It makes some sense to favor students who are excited about Columbia and are enthusiastic about becoming part of the student body over those students with slightly better admissions attributes who view Columbia as their penance for having failed to spend more on the GMAT and their essays.
Since this is a data-free argument, one could just as easily assert that students who genuinely want to attend Columbia are more likely to contribute as alumni than students who attend grudgingly.
In some ways Columbia is just being clever. One way to attract quality people who want a minimum of hassle with admissions is to give them a binding offer of admission early in the season. The applicants are happy because they are admitted to a quality school and the school is happy because it knows how many students are coming next year with greater precision.