Yeah, the flat leaf antennas are good enough I'd say for 98% of people living in urban or suburban areas. You need to be pretty far from the transmitter (50-75 miles) before you really need something beefier. Though close to 50 miles you might want to go with an amplified leaf antenna in case you need to mount it higher up on the wall or around a corner to get a decent signal. And it's always better to try with the cheaper, less-intrusive antenna first to see if it works, before you step up to the bigger Yagi-type.
The bigger problem is obstructions. I'm within range of the Los Angeles ATSC transmitters, but there's a big hill between my house and the antennas. So I get nothing.