I think Sejuani is very underrated. After her rework I think she can be considered a top tier jungle, maybe even better than Xin and Lee Sin. Now I'm not a madman, here's my reasoning:
-She has a good clear -Her ganks are better than 90% of junglers even pre-6, post-6 nearly every gank is a kill -Unlike Xin she is versatile, she can be a ganking jungler roaming from lane to lane, she can just farm thanks to her tankiness and sustain, she can even counter jungle well -Getting counter jungled? Max Q and not even Xin will out trade you once you have ancient golem. -Thanks to her Q allowing her to pass through walls she is as good as Lee Sin at stealing buffs and backing out and it makes her escapes godly -Finally she gets insane late game. Her ult wins team fights and her abilities keep the enemy team slowed constantly. The only jungler that carries harder late game is probably Hec.
If only you people had played her before the nerf...
You must be extremely deluded if you think Old Sej was better than New Sej. I could easily write a novel on how New Sej is superior.
And this is coming from someone who's played over 200 ranked games of old Sejuani. I've gotten from bronze to gold with almost solely her this season. So don't tell me I don't know how good old Sejuani was.
To put the rework in a nutshell:
Old Sejuani when ahead or fed > New Sejuani when ahead or fed.
New Sejuani when not ahead or fed >>>>>>>>>> Old Sejuani when not ahead or fed.
Try and work out which is more important in high level play.
Sure, old Sejuani could pubstomp even easier. But guess what? A champion's ability to pubstomp does not indicate how good they are on a competitive level.