| Name | Reviewer | Quote | Score |
| GameZone.com (GameBoy Advance) | Louis Bedigian | Mario and Luigi: Superstar Saga is carried through in all of the ways that matter. | 9.4 out of 10 |
| GamersPulse.com (GameBoy Advance) | Natron | This game is a must-have for those who like either Mario and Luigi or RPGs. | 47 out of 50 |
| TechTV.com (GameBoy Advance) | Darryl Vassar | This is as light and unpretentious as RPGs get. | 5 out of 5 |
| N-Philes.com (GameBoy Advance) | Jeff Green | While it May not be the original 2D Mario game everybody is asking for, Mario & Luigi: Superstar Saga still might be the best Mario game available to play on the Game Boy Advance. | 9.9 out of 10 |
| Nintendojo.com (GameBoy Advance) | Staff | I recommend this game to everyone and encourage you to pick up this under-promoted gem. | 9.5 out of 10 |
| Just-RPG.com (GameBoy Advance) | Eric Arevalo | There is not much to Find fault with in this game beyond the initial frustration with controlling both brothers. | 96% |
| Deeko.com (GameBoy Advance) | Pete | Mario & Luigi is a worthy unofficial sequel to Paper Mario and Super Mario RPG. | 9.5 out of 10 |
| PlanetGameCube.com (GameBoy Advance) | Jonathan Metts | Mario & Luigi continues, enhances, even reinvents the Mario RPG series. | 9.5 out of 10 |
| ArmchairEmpire.com (GameBoy Advance) | Omni | Every GameBoy Advance owner should have a copy of Mario & Luigi: Superstar Saga in their game library. | 9.5 out of 10 |
| Gamenikki.com (GameBoy Advance) | Jon Point-du-Jour | Buy this game immediately, or die trying. | 9.5 out of 10 |
| GameInformer.com (GameBoy Advance) | Staff | While everything has a more kid-friendly look than most Mario games, the Graphics are incredibly sharp and rival anything else on the system. | 9.5 out of 10 |