The Vargur, together with the Golem, can fit the thickest active tank in the game for any sub-capital ship, able to use an x-large shield booster, the bastion module, and the shield boost amplifier module to field an active shield tank of upwards of 600 hp/sec along with 75%+ global shield resists. The true beauty of the Vargur's tank, though, is that unlike the armor marauders, the Vargur can actually still be cap stable while tanking at that level.
The Vargur gains 10% bonus to its projectile weapon falloff per Minmatar Battleship level. As this is a T2 ship you won't be able to fly it without receiving the full 50% falloff bonus. This bonus gives the Vargur even greater range than Machariel at max level allowing the Vargur to use autocannons at unparalleled ranges. Additionally, the Vargur gains a powerful 7.5% tracking bonus per Marauders level allowing it to apply damage even at close range with ease. Together these two bonuses make the Vargur able to engage targets at a very wide range of distances.
In addition to strong application bonuses, the Vargur also gains a 100% hull bonus for weapon damage making its four guns equal to the eight guns that battleships usually have. In addition to this, the Vargur gains 7.5% damage bonus per Minmatar Battleship level, giving it 11 effective guns, which is then doubled by the Bastion Module up to 22 effective guns.
Also as with all Marauders, the Vargur gains access to the Bastion Module, which when activated immobilizes the Vargur for 60 seconds and blocks any incoming remote assistance (such as remote repairs), but gives increased range, enormously increased fire rate, additional damage resistance and additional local repair power. The combination of Bastion, Micro Jump Drive, and aforementioned tracking and falloff bonuses allows the Vargur to function as a massive turret that can teleport to any engagement range it wishes, output enormous amounts of damage with high accuracy, absorb and shrug off incoming fire, and then teleport out again before slower enemies can even get into range.
The less combat oriented 100% bonus to tractor beam range and velocity allows the Vargur to quickly loot wrecks and containers, combined with utility high slots this allows the Vargur to loot and salvage missions on the fly.