Guild Wars 2

Aside from the current issue of class stacking, I think playing according to your team composition is actually a pretty good way to climb. If you can’t climb or keep losing, learn 3 classes: 1 support/heal, 1 teamfight dps and 1 mobility/decap. When your queue pops, simply check what builds everyone has (check their weapons, not their class) and change your class accordingly to what your team needs. Tho it usually takes a bit of experience to see what you need more: healing, damage or mobility.
Sure, rotations and skill are extremely important, but team composition can be controlled instantly (unless class stacking and people don’t want to switch), while you can’t immediately get better/learn good rotations. I’ve done this for 2 days now and it works like a charm. Even though some games you simply cannot win (clown fiestas).
Oh and getting a duo queue buddy helps a ton, as it means less random bad ppl from soloq.

People ae still leaving the base at the start, so you can check their weapons?

I think he means your team.