Marc S has pretty much summed it up. The second half of the Norte might lack the distinctive cities that characterise the first half, but it's a pleasant walk with some nice smaller towns and villages along the way. The coastal landscape is similar to what you'd have experienced during your walk through Asturias - just a bit more rural, and at some point you start seeing more corn than cows.
Only negatives I can think of: Aviles is quite industrial, so the walk into and out of the city isn't the most inspiring, but it all comes with the territory. As Marc says, there's a lot of asphalt on this route so you might want to check for alternatives. You'll also start getting very familiar with the N-632, which coincides with the camino on a number of occasions (although there are hardly any cars, as everyone now uses the A-8 mega-highway, which you can unfortunately often hear rumbling in the background).
But back to the positives: I really like this part of the Norte, because many pilgrims veer off towards the Primitivo, so there's much less of a bed race. In turn, this can lead to more of a sense of pilgrim community as you tend to all meet up with the same pilgrims in the same albergues every night. There are also more consistently spaced - and open! - albergues on this stretch of the Norte, which is definitely a plus!