He is a great director and even his weaker films are still worth watching. Here are my ratings:
Women on the Verge of a Nervous Breakdown (1988) 8/10
Tie Me Up! Tie Me Down! (1989) 9/10
All About My Mother (1999) 9/10
Talk to Her (2002) 8/10
Bad Education (2004) 9/10
Volver (2006) 9/10
Broken Embraces (2009) 8/10
The Skin I Live In (2011) 9/10
Julieta (2016) 8/10
Pain and Glory (2019) 9/10
Bad Education - 9
Law of Desire - 8
Talk to Her - 8
Volver - 8
All About My Mother - 7
Pain and Glory - 7
Live Flesh - 7
Women on the Verge of a Nervous Breakdown - 7
The Flower of My Secret - 6
Broken Embraces - 6
The Skin I Live In - 6
Tie Me Up! Tie Me Down! - 5
I'm So Excited! - 5
Julieta - 4
Agreed, Almodovar is a maestro of film. All his movies hover around the 7-10 mark for me so I'll just rank the ones I've seen favourite to least favourite:
1. All About My Mother
2. Bad Education
3. Tie Me Up Tie Me Down
4. Law of Desire
5. Volver
6. The Skin I Live In
7. Broken Embraces
8. I'm So Excited
9. High Heels