The following is from Gamespot.com:

The Royal Naboo isn't the kind of civilization for the beginner. That's because their best units are late-game units, available in the later tech levels.

The Royal Naboo are good with air units and Jedi. They are better in both categories than even the Rebels and Empire, respectively. The Naboo get all air units, which consist of air transports, bombers, and fighters. All air units, as well as the air base, become available in the third tech level. Bombers and fighters can be upgraded in the fourth tech level to enhanced versions. You can also upgrade these enhanced air units to their ultimate versions, in similar fashion to the upgrading of heavy cavalry to paladins in Age of Kings.

The Royal Naboo, in addition to getting all air units, also get all air unit upgrades. Air units do not get upgrades for attack strength and range. However, technologies researchable at the air base can enhance many of the Naboo's aircraft in other measures. Naboo aircraft are more powerful than other factions' aircraft because they get all accuracy upgrades, armored-plate work for +4 armor, as well as shields, which effectively double their hit points. In addition, the Naboo get a unique technology that increases the speed of their aircraft by more than 10 percent.

The Naboo Jedi get nearly all the Jedi technologies. What they lack is the Jedi/Sith purge, the ability to automatically kill any unit they convert, as well as force strong, which would give them a +3 bonus to turning range. However, they get the Jedi padawan, knight, and master. They also get all other Jedi technologies, including Jedi mind trick, which they share with the Rebel Jedi, allowing them to turn their masters invisible. In addition, they, along with the Empire, are the only civilizations that can convert other Jedi with the upgrade called force influence.

The Royal Naboo unique unit is the royal crusader, a mounted trooper produced at the fortress. Of the Naboo's four unique technologies, two deal with this unique unit. The royal crusader is similar to the regular mounted trooper, except it has vastly greater hit points, with 175 hit points to the heavy mounted troopers' 135. The elite royal crusader gets even more hit points, and the battle armor unique technology adds another 25 percent to its hit points. As if that weren't enough, the unique tech shielding also gives them shields. They can thus take more punishment than an assault mech and are in fact very effective against most units.

The Royal Naboo appear on paper to be a civilization that becomes more powerful as you climb up the tech tree. Their strengths lie in technologically advanced units. While factions like the Wookiees might be stronger in the early stages because of their trooper strength, the Naboo really come into their own when you advance through the tech levels to more sophisticated weaponry.

As stated in the section on their units, the Royal Naboo are strong with air units and Jedi. In addition to getting full upgrades and all units of both types, what makes the Naboo better than any other faction with both units is an economic bonus. Naboo mine nova crystals 10 percent faster than any other civ, which means they can build Jedi and air units faster than anyone else because the cost for both units is half nova and half food or ore. The faster nova-harvesting also means they can buy high-end upgrades faster, which helps with other military units and economic upgrades as well. Again, this civilization bonus doesn't help in the first two tech levels, when virtually nothing costs nova, but in the later two tech levels, when most technologies and powerful units require at least half their cost in nova, it comes in very handy.

Interestingly, they are also very strong with ships, getting all ship units, possibly because Naboo is a water-heavy planet. Aside from ships, though, the Royal Naboo are otherwise very weak militarily, failing to get most high-end units and high-end technologies.

The Naboo are very deficient in mechs and artillery and not as strong as other civilizations in troopers. Naboo do not get the superheavy assault mech, nor do they get any of the tech level four upgrades for mechs, which leaves them weaker in mechs than nearly all other civilizations. That holds true for artillery, where Royal Naboo do not get the final technologies or units. In the trooper category, they don't get any tech level four upgrades or heavy mounted and repeater troopers. To compound matters, Naboo do not get the final armor upgrades for troopers or mechanized units. However, their unique unit, the royal crusader, makes up somewhat for the deficiency in ground units.