I feel that it is a bit unfair that rep doesn't carry over between the parent site and its meta. This is the case for every single one of the sites I've been a part in on the Stack Exchange Network. It makes little sense for someone with 5k+ rep to come to its site's meta and have just 1 rep. I know that at least some sites have rep being shared the other way around (meta->parent), but the fact that 0 rep whatsoever is shared from parent to meta seems somewhat illogical to me.
On every site except for Stack Overflow, rep is shared from parent user (main site) to their respective per-site meta user.
However, Meta Stack Overflow is a little different. It's not a normal per-site meta, it's kinda like a capital of Stack Exchange. Thus, rep is independent of any Stack Exchange site you are active on. You earn your own rep here. However, this will soon change. Meta Stack Overflow will soon be a per-site meta only for Stack Overflow, and Meta Stack Exchange will take the role of being the capital.