Yeah, Borderlands 1 is incredibly basic. The second game and onward have waaaaaay more interesting setpieces, enemy variety, and quests. The base content of the first game is 90% grey and brown dusty rocks, bandits, and animals.
If the main game is feeling like a bore to you, try just hopping straight into the DLCs-- they level scale based on the level you first enter them. I believe you can enter them via fast travel waypoints, there's one right in the hub of Fyrestone near the doctor.
The zombie DLC is great fun and has a great energy to it, should be a lot more engaging right away. The Mad Moxxi DLC is just pure arena shooting in waves if all you want is high tempo action. The General Knoxx DLC takes the base game's formula and refines it with a more interesting setting and a more focused story. The Claptrap DLC, which was released last, is kind of a wrap-up epilogue of everything that came before so it probably won't hit that hard unless you played everything else first.