I think we all start out that way (me too, just a year and a bit ago), but the random factors in the game, especially dice rolls, make such a list a "holy grail". Not that some lists aren't more winnable than others. I now strive for lists where the units make sense together (that takes experience playing), but mainly that are fun to play. For example, when I "load up" on lots of tactical squads, I generally win a lot more games. However, I find it a lot more fun (and challenging) to play only a couple of squads, and play more specialist units/vehicles.