It's waaay worse than dendro ganyu, at least ganyu can shoot forever or be played off field with extreme ease and strenght, tinari only gets 3 charge shots per skill (12s) and a fairly mediocre burst.
Dori really isnt like kuki at all, the first pratically really wants full ER with sac clay and gives flat energy while the latter has free infinite heal and can stack full EM making her good for reactions.
I think people are massively overrating dendro traveler just like they overrated electro traveler. He has the same issues collei has but with a more expensive/longer burst, awful application and useless passives (ah yes, EM = skill dmg on a character who does no dmg and wants ER). Collei's aplication is actually good and balanced around her skill, burst, floral ring passive and C6 that gives extra dendro hit. Either way they'll both probably be trivialized by the archon so colleibros shouldn't have expected much anyway.
If dendro traveler looks good it's cause this is the first time their kit actually fucking works instead of making everything worse. Traveler will probably be good on 2 dendro 2 elec comps while collei is better for solo dendro generalized comps, especially with c6.