Agents of SHIELD has really never been a huge ratings show since it first started, and it managed to stick around for four seasons
Yes it was. It totally was.
It premiered to a 4.70 rating and averaged a 2.40 over its first season.
Compare that to any other DC/Marvel comic book show's first season
Gotham: 3.30 premiere, 2.19 season one average
Supergirl: 3.15 premiere, 1.68 season one average
Lucifer: 2.43 premiere, 1.47 season one average
Agent Carter: 1.93 premiere, 1.51 season one average
The Flash: 1.90 premiere, 1.44 season one average
Constantine: 1.40 premiere, 0.92 season one average
Arrow: 1.30 premiere, 1.11 season one average
Legends of Tomorrow: 1.23 premiere, 0.80 season one average
Powerless: 1.08 premiere, 0.90 season one average (through 3 episodes)
Preacher: 0.90 premiere, 0.62 season one average
iZombie: 0.83 premiere, 0.65 season one average
Legion: 0.69 premiere, 0.61 season one average (through 2 episodes)
It was by far the most successful show on the list out of the gate, and it shed viewers faster than any of them. Now the show is lucky to beat Legends of Tomorrow on a weekly basis.