The multiplayer aspects are definitely the highlight of this game.
User Rating: 7 | Star Wars Battlefront: Renegade Squadron (Bundle) PSP
When I first played through RS I was disappointed. The single-player campaign is sorely lacking. A handful (about 10) missions is all you get and those are pretty easy. The missions are straightforward -- gather some equipment, kill the bad guys, etc. Nothing particularly challenging or interesting. They missions are also too easy. They don't require too much thought or planning. They don't need any skill. Just follow the directions and shoot everything in sight. When compared to the last game I finished, Navy Seals Tactical Strike, RS is lame. Tactical Strike requires planning to get your team to complete the mission. RS doesn't.
This game's strength is in the multiplayer side. However, I don't play many multiplayer games, so I missed out on this one. If you like multiplayer, then go for this game, otherwise, spend your money elsewhere. 
