Indian Railway Catering & Tourism Corporation [IRCTC] — vivek maq express train no. 22851

Yesterday my parents started their journey in this train (Vivek maq express_22851) from salem to mangalore under a reserved sleeper class ticket. I have got a list of complaints against this train & railways.
1) the coach is not maintained cleanly (Dirty smelling)
2) no water in the toilets on the 2nd day of journey
3) no ttr has come to check the ticket or talk about the issues
4) in reserved class coach, other unreserved youngsters have occupied the seats, still no question against them from any staff/officials
My question is:
If reserved passengers are facing these many problems, would they prefer to travel by it again??
Where the hell had been the staff/officials/ttrs? Why none of them were available to even check on tickets??
It is very frustrating to hear my parents (Both are senior citizens) talk on the inconvenience they faced through the journey.