The "Member" role has been removed, and it has been replaced by level roles. These roles were also changed:

Member, Tier 1 - Levels 2-5; Member, Tier 2 - Levels 6-7; Member, Tier 3 - Levels 8-9; Member, Tier 4 - Level 10 and above;

The reason why you only get Tier 1 at level 2 is so that those who are level 1 and haven't talked at all would be subject to prune.