The best option to get the city vice viersa is by flybussen. Fix schedule; stop at certain places; cheaper and Free Wi Fi. The airport it self is very good; eficient; but expensive #TravelingNorge
I would rate this as an average airport. Kind of slow security and the free WiFi usually is very slow, or don't work at all...... Like today when I'm writing this tip roaming as WiFi is dead.
For first impressions this airport sets a tone that Norway ain't got their shit together. Passport control is ridiculous. When asking the agent how long the wait is- his response "a long time."