Yes, involving the USSS was the first seriously questionable decision MIT made. I hope Prof Abelson's report includes who made that decision, when, on what evidence, and why.
I'd be fine with invoking the USSS if there were serious crime going on -- someone using MIT to host cp, or compromising research integrity, or planning violence or financial crime, etc.
If it's someone using your network resources in excess of terms of service, to download another freely available resource in excess of service.
I'd give a technically lesser party (say, a small business, or an individual, or a local government office) a pass if they called the USSS in on something, since they might not be competent to figure out what is going on. However, MIT is clearly in a position to know exactly what was happening.
I'd be inclined to wait for Abelson's report, but from what I've seen so far, MIT Libraries, MIT IS&T, MIT Police, and the MIT Office of General Counsel are all to blame to some extent.
The lion's share of the blame falls on USA Carmen M. Ortiz, AUSA Stephen P. Heymann, and AUSA Scott L. Garland, however, and on Congress for passing unreasonable computer crime and copyright laws with such absurdly excessive criminal penalties.