Good game that suffers from being too linear under 20-30 hours in. At that point, the game opens up and gets great fun (the combat system is very interesting once it gets completely revealed). If you can get through the 20-30 hours to get to the "real" game, it's a fun ride.
Like all Piggyback guides, this is a very well constructed guide that offers all the info you need, but with minimal spoilers. The walkthrough offers all the info you need to get through the battles and where to power level. It offers great info on how to upgrade your weapons and paradigm system. I highly recommend this guide.