Season 7 is excellent. Ezri works remarkably well, though it is a shame that her stories (although necessary) deprived other characters their chance to shine - notably Colm Meaney, but also Cirroc Lofton.
With episodes like Shadows and Symbols, Treachery, Faith and the Great River, Once More Unto the Breach, The Siege of AR-558, It's Only a Paper Moon, Inter Arma Enim Silent Leges, Badda-Bing, Badda-Bang, and the entire final chapter, there wasn't a lot wrong.
The only missed opportunities were the forgettable Chrysalis, Prodigal Daughter, The Emperor's New Cloak and Extreme Measures. Even so, they are decent episodes, but just could have been something better in the final season.
On balance, I prefer the seventh series to the first, third and sixth.