I have worked in teams both as a member and as a leader, and in both cases I loved the experience. As a leader, the best thing was the organization and consistency I applied and the fact that the team responded, generating good results. The worst thing was the conditions provided by management, which were not very good.
As part of the team, the best part was sharing day-to-day experiences and supporting each other in achieving our goals. The worst part was a colleague who wanted to take advantage of the work of others.
Have you been a part of big teams or were they small?
The largest one I've been to had more than 20 people, the smallest no more than 5.