Yes she brought one woman dominance in party and was in favour of strong center and weak states. She did destroy opposition parties and destabilise state govts, misused her powers, did not let regional leaders grow which is why INC still lacks credible regional leaders.
She had bazillion flaws, brought laws, amendments at whim, violated human rights, muzzled democracy, played dangerous communal politics. But as a leader she was very much articulate, mingled with masses, would get off car and rush into the mobs, crowds, dress like locals, advertised herself and her family well as an ideal family. She was educated at Oxford and is not uneducated.
To be honest, her DIL was also a more astute politician and it is no mean feat to rebuild party and rule for 10 years using a world class economist as a PM to also wash sins of 1984. Sonia was also more brainy compared to her silly kids, who seem clueless and lack wit.
I can see sense of Gandhis when they let go of Captain and favoured Sidhu who is a turncoat anyway and happily destroyed own party in Punjab making way for AAP. The siblings have ZERO political acumen compared to their great grandfather, granny and parents.