You'll soon realize that there is a select group of very loud mouthed people that need a huge supply of tissues while they explain to you the horrible dice problem on the site. Then there are the rest of us, that take it easy when the dice are bad, and strike while the iron is hot so to speak. Yes, the dice are more "streaky" than real dice, but it's isn't really a problem if you use common sense, because it does even out in the end.
Also, try to quickly understnad under what circumstances it is advantageous to attack. For example, 4v3 is your friend, 3v2 isn't, you'll get the hang of it soon enough if you use your brain and keep your eyes open

To answer your question; Large standard (escalating especially) games 6-8player usually seperate the men from the boys, and although one has to put up with idiots making idiot plays every now and then, in the long run the better players will take home the most games. Might want to stick to esc though, as flatrate & no spoils 6-8player often turn into stalemate nightmares

If you can find a good teammates or three to play with, you'll quickly see how teamgames seperate the warrioirs from the jesters very effectively. if you want to depend on skill stick to escalating or no spoils, as flatrate is the third headache factor after drop and dice in my opinion (though some will argue that the in/ability to get 3 or 4 card sets in esc makes the luck factor there as bad)
Observe the wily ways of the dice, lol, ignore the nay sayers, and play with a wide variety of people, try a wwide variety of maps and settings, and don't worry too much about rank in the start. pick up some experience, then go use it against the rest of us

good luck, and welcome to CC.
tldr version; read Georgerx7di's response, It's spot on.