Iliad is an epic poem which it tells about the 10 year war between Achaeans (one of the four major ancient Greek tribes) and Troyans.It is full of battles between two big armies (55.000 Achaeans and 40.000 Trojans) but in the series it seems like two schools are in an argue.
You feel like that the two armies has maximum 200 soldiers with no big battles.
Apart from that there are many serious mistakes from the original poem.
1) Iphegenia never sacrificed. The last moment goddess Artemis replaced her with a deer and took her as her priestess. 2) Achilleas fought hard to take Patroclus dead body. No one gave it to him. 3) Helen never betrayed the Trojans with the Trojan Horse 4) Ajax is descibed as "is described as of great stature, colossal frame and strongest of all the Achaeans" and not this short guy in the show 5) The tunnel that they were making in one week is between 2 cities with 500km distance
Apart from that there are many serious mistakes from the original poem.
1) Iphegenia never sacrificed. The last moment goddess Artemis replaced her with a deer and took her as her priestess. 2) Achilleas fought hard to take Patroclus dead body. No one gave it to him. 3) Helen never betrayed the Trojans with the Trojan Horse 4) Ajax is descibed as "is described as of great stature, colossal frame and strongest of all the Achaeans" and not this short guy in the show 5) The tunnel that they were making in one week is between 2 cities with 500km distance