It's not that I never had faith in this series, but they took a concept that could have easily tired out after a few episodes and ran with it for a full two seasons. Gimmick sitcoms tend to either do really well or get easily forgotten. Even if you have a strong enough concept, how is it going to play out beyond the scope of said concept? How can you expand upon that slow enough to fill out a series, yet have just enough pull back in case it doesn't last? It is a tricky format, which is why most sitcoms are the same.
We don't have the luxury of having a sitcom last only 2 seasons and have it come back bigger and stronger with years of syndication and cult following for these shows as of yet. The 60's was a time where they could be experimental, but the shows that are most well remembered have either been decent hits (Get Smart), or short lived and considered less than spectacular in their day (The Munsters). The 80's was also experimental, but lent itself to more flops than most. ALF was pretty much the only experimental series that was considered successful, and it was only around a few years. But successful enough it had 2 cartoon series co-current. And frankly, other than the fact Third Rock managed to somehow stay popular for 6 seasons in the 90's, no other Alien sitcom has had any of the love and audience of those two, and said alien sitcoms are constantly compared to both.
As for this show, it could have totally been just about Will Forte wandering the country every episode, and having that get old quick. But they did the smart thing in the first episode, making the series's title an Artifact title as soon as the episode was about to end. It was a huge risk on saying he wasn't the last person on Earth by the time the first episode ended, but it paid off, as did introducing other characters. If it wasn't for others to play off of, the show just wouldn't have the same feel.