Archon Hessarian the Redeemed.
Dorian the Redeemer.
Dorian the next Hessarian?
Tevinter can be great once again, it just needs what Hessarian did before. Another Transfiguration. Maybe with fewer heads rolling. Perhaps even Dorian could lead it. The blood magic may be helping with the battles against the qunari, but it is blood magic that made the empire crumble to its current state and it recovered/stabilized without rampant blood magic. It really should be more limited if not removed.
Some magisters are evil, some magisters are really nice and cool. Tevinter has some big villains, but we are told that they do have their heroes, but we don't know much about them outside Tevinter.
There is corruption in the government and within the Chantry hierarchy. This is not unique to Tevinter, but there are those in Tevinter who fight this corruption, and even magisters who criticize/oppose blood magic (WoT, p. 109). There are also those who oppose slavery, although if they don't have strong allies they are assassinated.
It is pretty difficult to try new systems and change when everyone opposes you (except the dwarves). It's like Orzammar, stuck in a harsh system because they think it helps them survive and remain stable, and introducing any change causes great tension and possible violence.
Bring on the Second Transfiguration, Dorian for Archon!