Natterjack,
don't worry, I've been to DEL and back with SU earlier this year, over on the IL96 and back B767. They're fine. Visited flight deck, the crew were happy to chat and talk about the plane.
I've been flying about 10-15 flights each year on SU, mostly Tu154 (couple of 134s... still waiting for a chance on an IL86) and generally they are fine, I'd say they are under-rated. Food is not great but ok. Seats on the 134 are a bit tight but the 154 is ok. Even the cabin crew are ok - they seem to put the young hosties, who are pretty but grumpy, in economy and the retired shot putters in Business and they are really sweet and pleasant!
Chatted with a couple of 154 flight crew, they are generally pleasant and quite happy to talk about the aircraft etc.
Enjoy!