Multiple angles here...
First up... "Waling Dead is better"... well, Walking Dead isn't original either... and while I like that show, it isn't breaking new ground either for Zombies or for post-apocalyptic chaos.
Meanwhile... you might as well compare Falling Skies to Wagon Train... since Wagon Train involved a small group of people risking everything going West in hopes of finding food and safety, while avoiding dangers along the way and in-fighting... basically, the concept goes back a long ways
I think it is apt, however, to compare this to "V"... I found myself thinking about "V" a lot... this seemed like "V" IF we skipped the war and went right to the fight to survive... and if we didn't have all the pretense of friendship... then were just dumped right into the aftermath of the initial strike.
So... while there's not a lot of originality here, I think what we got was fairly well done and seems character driven... which is a good thing.
I was bothered, though, by how large groups of people were just wandering around in broad daylight... as if the aliens only hunted at night or something? Seemed like they would all be easy pickings walking down the road like that.
Breaking into smaller groups was a smart idea... to help hide... except if you still walk right down the main street during the day!