Like most things in life, I think it depends on the corner lot, and what you want.
We have one, but it works pretty well for us. We moved to MoCo after years in G'town, so were unfazed by people on the sidewalk, etc. We want to live somewhere that feels vibrant. The backyard is huge for the neighborhood and was grandfathered in with a fence on all sides (has been prohibited by code for the last 10 years or so). We added extra plantings inside the fence and there are municipal trees outside it buffering the sidewalk as well, so it's very private and we live out there when we can. It's nice only having a neighbor on one side after years of two party walls. We actually feel it makes us less of a robbery risk as we are on a pretty visible corner. There was a rash of burglaries in our neighborhood a few years back and our block was never hit.
Downsides -- shoveling (although I have officially made that DH's problem since we have 2 under 2

, some trash in the long side yard that fronts the street. I think the traffic will be more of an issue as the kids get older and want to go out and play by themselves, but that never crossed our childless minds when we bought.
Overall, you are more exposed but the tradeoffs may well be worth it, depending on what you want.