Kansas is legendary, that much is certain. A few of their albums are in my Top 20 list (i.e., Masque, Song For America, Leftoverture). I absolutely loved that band in the '70s.
Musically, they're still just as tight as they always were.
Vocally, however...
Steve Walsh used to have one of the most distinctive and laudable voices in rock. Today, though, he's reduced to a raspy, thin growl. Granted, I haven't seen them in 4-5 years. But I saw them a lot in the '90s (one time at this dive of a dance club in St. Louis; it was embarrassing) and Steve's voice was pretty far gone. Unless a miracle occurred since then, it's still gone.
Without Kerry Livgren, Robby Steinhardt, and Steve Walsh's soaring vocals, it's just not Kansas any more.
Just my two cents worth...