I thought Maroon 5 captured the late 80s sound with their hit single, "This Love"...
As far as Kravitz's work with Chicago... Jason was bad, but Robert's lazy lounge singer crooning "What's been going on..." usually has me pushing the skip button before he even finishes the first syllable.
Kravitz has a reputation as a control freak and has to include himself in songs he produces, and "The Only One" wasn't an exception.
Ironically, when he comes in at the end of the song, that's the part I actually enjoy.
Lamm (he of no small ego - can you tell I'm finally OVER this band?) has taken to singing other people's songs like he's in a coma in recent years. On the Xmas and big band stuff (except for maybe "Caravan" and "Feel" where he SO over the top, it's comical - "my first single lead vocal since 1977....LAAAHHHHHHHHHH!") he sounds like he talking in his sleep he's so bored. Why? He didn't write it, so it's not good and he's not going to put the effort in.
I like the Kravitz vocal bit at the end a lot, too.