She had a good voice. But I really blame her for opening an era in which female singers focus on vocal gymnastics with little regard for interesting music. Although their stuff can be pleasant, Houston, Mariah Carey, Katy Perry, Adele, and plenty of others just sing impressively while (often) a thumping back beat is about all that accompanies them.
Boring.
I wouldn’t lump in Adele with the rest of them.