It definitely lacks a new race or a new class to entice people in, so in that regard it's definitely less in terms of features - but we'll see when the alpha / beta comes along to show us what's really going on. Honestly, I don't think we should expect as much promise as Legion or BfA since it seems Blizzard finally learned their lesson about revealing things they can never promise in time. Towards that end we may actually get more features as the patches come along, which I'm fine with if they stick around.
Regardless though, it does seem to be more modest than other expansions.