Since the storyline propels you linearly, I wouldn't call it RPG except for a few elements like the 'conversation wheel' and cutscenes. Choices doesn't make
enough impact on your character in the end. Some choices in SP leaves you with leaving your friends behind to die, is supposedly sufficient to call it
consequential, but I wouldn't call it roleplay.
I suppose the definition of RPG is subjective. In my view, the game provides many choices that impact the overall game experience -- though not, admittedly the main story arc.
At any rate, I respect the opinions of you and Minuos and agree that there is room for improvement.