You must not really use them then, if anything dominas changed the most in single player. As Seleuceia mentioned, their biggest problem is that the game can be over in an MP match before they can even be built. In single player the fact that dominas can actually heal stuff now without being micro managed means they're a very solid unit if you can afford to get them. Granted, as Seleuceia says they're mainly for your Caps and titan as they can't heal multiple targets at once like the Hoshiko, but considering such units are much more important for the Advent than the TEC its a good thing.

Also, having made them available for the Advent Rebels in my mod without research, I've occasionally been surprised at how good suppression can be. It might even be a bit better than demobots if you could keep your Dominas charged with antimatter, maybe if a TEC ally lends his level 6 Dunov...

alright, any recommended uses to make me see the light?

While I like desdras, you can't rely on heavy cruisers against human players. They usually build a lot of bombers late game to deal with starbases and titans, and will own heavy cruisers.

And they're only 4 fleet supply, building a couple to heal your caps is hardly a big investment once you have the research. 

dominas's are op.. no kidding here esp when using perseverance on titans and high level caps. They become immune during the ability casting and gain 1000 Hp if the cast finishes.

They are the late game utility cruiser of choice.. Everyone builds these things and titans love to have them around.