AIIMS Rishikesh, Raipur or Patna all are well reputed institutes and should not be underestimated. They are institutes of national importance and autonomous institutes of central government.
The infrastructure of AIIMS Raipur is better than most state medical colleges of India. The only disadvantage is that you won't be able to get a 50% state quota in NEET PG.
The core points of these institutes are:
Infrastructure
Faculty
Facilities
Fees
AIIMS title
Small batch size facilitates better teaching
So yes, it’s worth taking admission at AIIMS Raipur or Patna for MBBS.