I mean this is a natural result of the smaller SSN force - the smaller you go the higher is the risk that no subs would be availiable for duties.
For RuN, readiness was vastly improved since we actually got the funding going (around 2010), this (unofficial, made out of the open data):
(the table shows SSNs of Akula series with historical and projected statuses. gray = reserve; yellow = repairs, refits and modernisation; green = availiable for duties)
Currently it appears that we plan to maintain a ~24 strong force of non strategic nuclear submarines (ie SSNs and SSGNs) between the various classes. This allows us to deploy more than one such submarine on missions, you may remember the reports regarding Kuznetsov's sortie into the Med when multiple subs participated.
Only in 00s (and now in 10s) we got the money to fix the submarine fleet's problems, including decomissioning the nuclear reactors. One of the big projects in the later area was decomissioning the support vessel we were using for refuelling, as it had a lot of spent fuel assemblies in it. You can read more here:
http://www.rosatom.ru/production/safety/ (unfortunately the eng version of Rosatom website appears to lack the data)
So while there were problems in the past due to the funding problems they are by now largerly either solved or in the process of being solved, so propelling the myth about "useless russian rusting submarines" serves noone. Also, an interesting graph (this time in english):
(note this graph depicts nuclear submarines of all types, with Delta and Victor series being counted as 2nd gen SSBNs)