I've smoked quite a few Davidoffs and Dunhills and can say that I've only been dissappointed in a small number of them. Now, I am getting these from highly respected places, so there's no question of provenance. Each have there own distinct personality and whether or not something is worth it is a personal opinion. I've rarely been upset at myself for spending "too much" for a cigar, because I know before I buy it whether or not it'll be worth it to me.
FWIW, here's a listing of cA reviews of Davidoffs:
Cuban Davidoff Test Results
1000: A punchy little cigar with a lot of flavor, the 1000 shows medium-bodied, rich tobacco and coffee character, yet remains subtle and elegant. -91
Ambassadrice: This is always a lovely panetela to smoke with medium-bodied, rich coffee and milk-chocolate aromas and flavors, and a long fresh aftertaste. Their only drawback is that they sometimes are a little rough to draw. -88
2000: Mellow and rich, the 2000 is a full-bodied cigar with lots of spicy nutty character and opulent flavors in the aftertaste. -91
3000: An easy, rich cigar with the fine draw and lovely construction. With each draw it delivers more and more flavor. -89
Château Margaux: Burns wonderfully. This cigar is packed with rich tobacco flavor yet remains refined. It's medium-bodied with a cedarlike tobacco character and a wonderful draw.-92
Château Mouton-Rothschild: A big voluptuous cigar with round and rich leather tobacco character and a wonderful draw. -94
4000: The surprise of the tasting, the 4000 is a knockout with spellbinding aromas and flavors of cedars and tobacco. It's an absolutely seductive smoke. -97
No.2: Full-bodied and rich for such an elegant-looking cigar, the No.2 burns wonderfully and delivers plenty of flavor. -93
Château Haut-Brion: This has always been a powerful smoke for such a little cigar. Sometimes we find the Haut-Brion a little overpowering but it can be a great quick cigar following a big meal. -86
Aniversario 80: This cigar was made to celebrate Zino Davidoff's 80th birthday. It is generous and rich with full-bodied flavors of cedar and tobacco, yet it remains refined on the palate. -99
Dom Perignon: The DP has always been a favorite, a bench mark for Churchill-sized cigars. It's full-bodied with intense spicy, earthy cocoa character that continues through the last puff. -96
No.1: Medium-bodied and firmly constructed, the No.1 delivers exotic aromas and flavors with hints of leather and tobacco. -94
Château Latour: A wonderfully rich cigar with loads of cedar, tobacco character and fine even burn. -94
I have yet to try the following: Margaux, Mouton-Rothschild, Aniversario 80, but have had multiples of the others, though the Latours I've had were limited to just a couple. I pretty much concur with these reviews. As far as Dunhills, my experience is more limited and I've only smoked about three-four of the Dunhill vitolas, with the Atados being the most and also the best, of the bunch.