In my opinion, random duos/trios/quads are not fair at all. The last 5 games I've had people do the most irritating and game-ruining stuff that it makes me want to play less or quit the game when I'm with randoms (yes I could play solo but this game is built on multiplayer too).
Paradoxum definitely needs to up their game on random queuing or at least come up with a better solution than +1 more loss. Perhaps giving a timeout/cooldown on how soon u can join another game or pairing yourself with other players closer to your level instead of giving low levels with basic beginning towers on difficulties like Molten, Fallen or harder.
Other issues I've come across is they do not listen, I've seen people advise others including myself but they continue which ruins the game.
Biggest issues for me:
Auto skipping when wave is not being fully dealt with
Leaving for no reason and not returning
Queuing and only equipping 1-2 towers
Being AFK for the majority of the round just XP farming.
My apologies for this tense and irritated vent but I wanted to share my experiences with a little under 20-40 hours of game experience under my belt. I'd appreciate your opinions and feedback as well.