Yep. Too easy? Like it could be easier driving from A to B following the route on the map?
In my opinion, this is a symptom rather than a cause. The real problem is that, in GTAIV, driving from A to B just isn't all that much fun. There's very little by way of jumps, the layout is pretty dull and the car handling punishes crazy full-speed driving. San Andreas suffered from the first two problems, but not the third. GTA3 and Vice City, however, kept drives shorter and they could always get crazy even on a straight A to B drive, keeping them interesting.
That I find myself using taxis more than driving and wishing I could skip those huge boring mission drives tells me that the main meat of the game, the driving, is not working.