First just felt the most realistic to me (probably because it had a lot of military scenes and was probably a Pentagon propaganda) and a lot of the interactions between the humans just made sense to me.
2 wasn’t that bad imo because I only watched it for cool robot fights and a lot of the scenes were still memorable. Next ones get progressive worse, literally the only thing I remember is that they had Sentinel Prime, robot dinos, and robot knights. Felt like cash grabs