Well, pretty clear you don't like the Fantom G..lol, however there is a lot of misinformation in your post that needs correcting.
1. When you press play in Sonar, if you have setup the fantom correctly then there are simply no issues. There is the possibility to control the Fantom SPP from Sonar but its clear you have not set that up. You can also control Sonar and the marker from the Fantom, but using Sonar as a slave on a regular basis is not practical.
2. While like every traditional synth, every single knob, control and internal parameter is accessible over midi, it is not a CC based midi controller and was not designed or advertised as such...its a synth. The fact that it isn't a CC based midi controller shouldn't be a surprise.
3. It absolutely DOES does transmit midi to outputs in single mode. In fact the Fantom has push button access on the pads to transmit to any, some or all of the 16 midi channels. In Live mode, with the ability to setup keyboard zones for all external channels, as a keyboard controller the Fantom is outstanding.
4. It may not work with every single USB drive on the planet, but this is not uncommon for any device. I have purchased several sandisk and HP (without reference to the Rolandclan) and had zero issues in 5 years.
5. Breaking off a USB port is more a reflection of your care of equipment. The Fantom is built like a tank.
6. The non-existent driver for windows 8 is here
http://www.roland.com/support/article/?q=downloads&p=FANTOM-G8 I am delighted that you enjoy Motif, and agree that ongoing support is likely to be better for the Motif, but its also much much harder to use with a very complicated UI, much menu diving and a tiny screen. If you value immediacy, particularly in the control of external gear, the Fantom is superior imo.
Whether any synth is a viable midi controller for complete control over VST is still a question for me. Even dedicated midi controllers like Novation still leave lots to be desired and have a high frustration level.
vladasyn
You can use it theoretically but it does not work. In fact Fantom is a pain. It randomly starts playing sequences from the sequencer when you press Play in Sonar, it is too complicated to be a midi comptroller. It does not transmit MIDI data to any outputs in Single mode- you have to set it up to even play notes in to your sequencer and save it on USB drive. It does not work with any USB drives- you need certain USB drives from the list found on Roland Clan forum. My USN port broke off. Fantom USB driver is not compatible and will not be compatible with Windows 8 computers. My main controller is Yamaha Motif. If you have money for Fantom 8, please, do yourself a favor, get Yamaha Motif FX 8. This board is amazing. It is also a great controller. I have no issues with Motif XS 8. Keyboard is great- keys- awesome. Midi works. No timing issues. And- no it does not control play/stop in sonar, but my qwerty keyboard does.