In the game "Three Kingdoms: Quest for Supremacy," Xu Shu is designed as a character with both support and combo capabilities, making him one of the more effective roles. In terms of his positioning, I would recommend him, as there are currently quite a few combo characters available. You can familiarize yourself with these combo characters and then arrange them into a combo team, in which case Xu Shu will be very useful.
Let's first talk about Xu Shu's ultimate skill, Recommendation. This is indeed a powerful move. When Xu Shu uses this ultimate skill, it grants a Recommendation effect to nearby friendly units, instantly increasing their tactical attack speed by 509. More importantly, if the target happens to be a Shu general, the increase is even higher, up to 50%, and this effect lasts for 5 seconds. This is extremely crucial during battles, especially in team fights or key battles, as it enhances the output of Shu generals.

Next, let's discuss the combo skill. This skill gives our Shu generals a 35% chance to trigger a combo after a normal attack. Don't underestimate this 35% chance; once triggered, the damage of the combo increases by 65%. The Bright Recommendation skill is also excellent, giving our Shu generals a 25% chance to seal the enemy's tactics when they trigger a combo, and this sealing effect lasts for 3 seconds, effectively restricting the use of key enemy generals' skills in battle. The Loyal and Filial Warrior skill has its unique role too; Recommendation not only dispels the poison status from the target, ensuring the survival of the general, but also restores 245% of the target's attack force.
Finally, the Aid in Distress skill provides two major buffs to Shu generals. On one hand, it increases the combo chance of Shu generals by an additional 15%, enhancing the likelihood of triggering combos. On the other hand, it boosts the damage dealt during combos by an extra 100%. Xu Shu demonstrates impressive strength on the battlefield, with his various stats highlighting his unique combat abilities. In terms of attack, his attack value is as high as 16036. In terms of troops, Xu Shu has 133184, providing ample manpower reserves on the battlefield.

His command attribute is 83, indicating he has excellent leadership. However, generally, the main generals used are those with strong offensive capabilities, and since Xu Shu is mainly positioned as a support, this might have some impact. His critical hit attribute is 230, giving him the potential to deal significant damage in battle. His accuracy is 283, ensuring that his attacks hit the target accurately, preventing wasted opportunities due to frequent misses.
The critical damage is as high as 150, meaning that when a critical hit occurs, it not only hits the target but also deals considerable additional damage. His defense is 4444, which, while not particularly high, is understandable given his support role. His martial value is 64, which, although not outstanding compared to some renowned warriors, is sufficient for self-protection and combat in close quarters. His strategy attribute is 93, showing that he has a good level of intelligence.

His action speed is 100, ensuring a steady attack frequency and rhythm in battle. Additionally, Xu Shu has a special breakthrough bonus. Upon entering the battlefield, he immediately releases a tactic, which is strategically significant as it allows him to strike the enemy early in the battle. This tactic also has an 85% chance to remove control effects from friendly targets, calculated individually for each target. This means he can help allies break free from enemy control and regain their freedom of movement in battle. Furthermore, the breakthrough also brings a 15% increase in attack, 15% in defense, and 24% in troop strength, enhancing his overall combat capability on the battlefield.

This concludes the introduction to whether Xu Shu is useful in "Three Kingdoms: Quest for Supremacy." If you are looking for a versatile support character in the game, Xu Shu is definitely worth trying. Although his quality is not the highest, his basic stats are still quite good.