i agreed that ub scales far better (espacially with items) then most dgs. but early game the people are often to scared of spit than they should. yes indeed it is a great ability early game. but this does not make ub op. in fact around level 5-8 a minion ereb well played and build is more dangerous then any ub build, between level 1 and 10 an ub cant stand a chance vs a good sedna.
playing a ranged dd spit is not enough to win the flag domination if the ranged dd know how to use his range-advantage. but indeed, ub starts scaling better and end of mid or late game he is the strongest 1vs1 dg of all.
but the problem is that most people are simply scared of ub and are planing there builds and item usage for later levels instead of using their temporal advanteges to their maximum. you should use the dg advantages at the times you have them, they do not hold on fover all levels.
e.g. when i play sedna early game i push any dg away. if both factions are playing good then i will not get an item advantage due to kills to get better armor faster then my enemys. so arround level 9 (depednig on opposing dg) i will not be able to stand against most of the dg anymore. i must stand more back supporting my team more then being aggrassive myself. the 1vs1 time is over. the tactics and the advantages of the demigods are very very time specific and ub is not the best dg anytime!