I think from my own recollection and impressions that Dax became more interesting once Worf arrived and their relationship developed.
There are some season 2 episodes I remember liking a lot (I've forgotten it's name right now but the one where Odo discovers more about Kira's past is one of my favourites of DS9 which makes it more annoying when I forget it's name) but there are also a lot of middle of the road ones as well. I like the season finale, which then obviously starts to spin the series out in the direction it would eventually take overall.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist