What is the relative safety record of the Sukhoi Superjet 100?
The plane was flown into the ground with a clearly visible and well-known landing error, pitching down after a bounce. That said, to blame it squarely on the pilots is premature, especially as the crew will soon be able to shed light on what happened. I've done some of the same in simulators with heavy instrument failures, although their poor/lacking damage models let you get away with it.

On the actual question, the Superjet does not yet have a meaningful safety record of any kind, good or bad. It's seen far too little use, and it only had two accidents, one of which was confirmed as a pure human error CFIT. Driving a perfectly intact plane into a mountainside is akin to driving a car off a bridge. 

This leaves one accident where the plane had any faults at all, and such a small sample size is not enough to build any sort of statistics out of.

It's also difficult to distinguish cause and effect in the plane's simultaneous loss of popularity and reduction in support service levels amidst a political rift between its manufacturer's home country and most of the world, or infer anything technical from that.