I've flown on IL86, IL62M, TU154B-2, TU154M and TU134A-3. While passenger comfort is not as good as on comparable Western types, I found all to be very smooth in the air, and especially on landing.
The safety record of Soviet-built aircraft is based mostly in myth; the truth is, if you compare each aircraft type to its Western equivalents, they are just as safe. In fact, the only Soviet-era widebody, the IL86, has never had a crash involving loss of life.
Newer Russian aircraft are supposedly much better in terms of engine noise and comfort. Soviet-built aircraft are among the noisiest in the skies, which is why many types are banned outside of Russia nowadays. However, most of them have rear-mounted engines (with exception only of IL86, which is LOUD if you're seated behind the wing!), so cabin noise is comparable to a 727 or DC-9.
In terms of service, this varies per airline. Aeroflot has made HUGE strides in terms of passenger comfort and service, relegating most Soviet types to routes within Russia, using Western types on international routes. Having flown Aeroflot as recently as 1999, I found the service and staff to be as good as any European carrier I have ever flown, and the food was great. I also understand Aeroflot is refitting TU154s and IL86s with newer and more modern cabins so that passengers will travel in more comfort and style aboard these types.
In terms of in-flight entertainment, currently only the IL96-300 offers any sort of cinema or stereo channels onboard. I've never flown in one, so I don't know what the set-up is like. Other Soviet-era aircraft have no inflight entertainment to speak of.