I think it's fair to say that a lot of the MX guys' hate came from the fact that they were quite literally learning on the job, and while the Dash-1 and Dash-34 type manuals had been sourced and roughly translated, codified maintenance procedures were not supplied.
Sometimes this trial and error approach caused more problems that only became evident when a catastrophic failure occurred. For example, they very nearly lost an aircraft and pilot to a complete hydraulics failure. When the aircraft landed, it was discovered that something big had punctured the main hydraulic line. The cause was traced to a wiring loom. The wing pylons had been removed on arrival in the US, and this particular loom and its coke can-size connector had been stuffed up inside the wing as an alternative to ripping them out; the slack cable had snagged the wing sweep mechanism, and each time the sweep was cycled the loom was pulled closer to the hydraulic line in the leading edge root extension. Eventually, the mechanism finally pulled the connector straight through the line - while the pilot was way above the Mach and flying ACM against a pair of F-15s. His survival was a very close run thing. So, I don't doubt that some of the hate also came from the fact that there was massive pressure to fix these things without really knowing what the consequences of their improvised procedures might be.
Same sort of thing happened with the US-installed fire warning detection system (taken from a KC-135, IIRC) which was installed because the Russian system was not trusted, but which constantly caused false alarms that MX was required to respond to by breaking the jet in half (a la F-100) and pulling the engine. Beyond that, the six month groundings due to wing through carry box cracks, leaking fuel cells, and a raft of other problems meant that I don't think that there was very much for the MX guys to like.
Everyone seemed to really like the early-model Fishbeds, though.
Thanks!