Actually there are a lot of things that hint that the Gith fight isn't just an encounter on the road where you fight gith instead of gnolles or goblins.
- Shadowheart tells you multiple times, that you shouldn't trust Lae'zel. Additionally at some point you have a dialog option with Lae'zel, where you can do a wisdom check to figure out that something is suspicious (I don't remember the exact dialoge).
- Zorru tells you that the Gith he saw are cold blooded murderers that instantly killed his friend.
- When you get close to the patrol you see the dragon fly above you. Your party has to save against fear and makes comments that the dragon is probably looking for them.
- Before you go down to the gith there is a sneaking ranger who tells you to keep silent and find another route to stay save.
- The cinematic when the dragon destroys the bridge should get on high alert even if you ignored everything else.
In my opinion that fight is well balanced, considering that it seems to be the fastest and storywise easiest way out of act 1 and rewards you with a ton of powerful items. You can certainly win this fight without metagaming or cheese.
