Now I've seen them extensively on track, here's my ranking.
1. Haas - Clean, traditional, quite classy (this is ignoring the reasons behind it!)
2. Alpine - I love the French Racing Blue, but would have preferred it not to be matte.
3. Alpha Tauri - A bit more white on the front would be nice to differentiate between them and Mercedes, especially when DRS is open.
4. Williams - I really like it on track. Let down by the weird black gap at the bottom though.
5. Aston Martin - Confusing with Merc from a distance, esp in the lights. The pink kind of lets it down up close.
6. Alfa Romeo - A little messy at the back, but generally nice.
7. McLaren - Pretty dull, but the blue shade is good.
8. Red Bull - Bog standard RBR, nothing terrible but nothing that makes it remarkable.
9. Mercedes - A complete mess at the back. Looks like a Stoddart era Minardi.
10. Ferrari - I like the idea of the two tones, but the execution is terrible - like an afterthought. Then that green MW... yuck.