The Tour and the Giro both have mostly flat and boring-looking first weeks. The Vuelta have tried to go in the other direction with the Arrate and Jaca, which are good, but that stage to Valdezcarray is going to be a useless one. The Giro could've done with a hilly stage as soon as they get to Italy. Also, the TTT would've been better as an ITT looking at the rest of the route.
The Vuelta has an interesting looking second week too, with a MTF at each end, an ITT in the middle, and a few uphill sprints in Barcelona and Dumbria. Giro looks alright too with hilly stages and then the Cervinia stage which looks quite a tough finish. Stage 7 and 8 of the Tour look interesting, but not GC-wise, and aside from La Toussire, the Alps don't look great.
With the Vuelta and Giro both heavily backloaded, the final week is obviously what we'll be looking forward to. The Vuelta could really do without that stage to Fuente De, and it would've been better to have a transition day between Covadonga and Cuitu Negru. An 30km ITT instead of either stage 18 or 19 would've been an improvement too. Last two stages, no complaints. Bola Del Mundo should be great.
No real complaints about the Giro's final week, apart from maybe the final three days look too draining without a sprint stage between Stelvio and the ITT. Before that, the mountains are broken up pretty well with some flatter days inbetween.
Again with the Tour, you can't help but feel the mountains are disappointing. The 'queen' stage with the descent off the Peyresourde should be exciting, and somebody will have to attack on the Peyregaudes stage, but the mountains really do look anaemic this year. The route will be a failure if someone has more or less won before the TT anyway.
Giro - 8.5/10
Tour - 4/10
Vuelta - 7/10