Quote from Rod Shaft:
It's a lot less useful now than it was 2 years ago, that's for sure. I think that the main reason is reserve size. Although it existed back then too, market makers have become very adept at using it to their advantage with huge size, especially in periods of low volatility. If you ask me, reserve size is a huge advantage to market makers and is completely unfair. If someone wants to bid 100000 shares, they should have to display 100000 shares, not 100 with 99000 magically hidden shares behind it. It makes Level 2 a complete joke at times and can be very difficult to read. The SEC should step in and do something about this.