YES IT IS!
Approaching 3 years in our 2008 Prius (this June 21). We seem to average around 48 MPG. I get over 50 driving around town. My wife has a heavier foot and rarely engages the so called stealth mode so averages somewhat less. Battery life should be at least 10 years. Toyota is very conservative with charge-discharge parameters so the battery pack never goes above 80% or less than 20% capacity. Wish I had a little more power in electric mode but with a light foot and not running the A/C compressor I can accelerate up to 40 mph. At 41 mph the engine will fire up unless I'm going downhill. The car is hardly a golf cart and could function as a primary family vehicle. With gas now over $4 a gallon in Western NY and likely to be in the $5 per gallon range this summer the worthiness factor will only continue to increase! So, if continuing to send our dollars to governments that hate our guts and work to undermine our country gives you a warm feeling, then enjoy it while you can. I'm already on the waiting list for the plug in Prius!
