I found amazing statistics that present a great initial step of Steem/Steemit.
Among various measurements, number of transaction is one of important gauge that represents a success of a ecosystem unless it is abused by spams. I will report three graphs as follows: of Bitcoin, Ethereum, and Steem. In short, as of 2016/07/19 Steem already passed Ethereum's transaction scale, and is heading to Bitcoin's.
Charts
Bitcoin: 222k transactions per day and fluctuating between 175k and 250k (Source)
Ethereum: 37.9k txs per day and quite stable near 40k (Source)
Steem: 116k txs per day and rapidly increasing from 20k (Source)
A good news is we have enough room for new transactions (at least 8 million transactions per day).
I believe Steem will pass Bitcoin's number of transactions in the near future!