You dont have to be Spielberg or Cameron to do some groundbreaking action scenes, before LOTR and KK Peter Jackson wasnt known for his action scene's yet both had plenty which were superb, Raimi wasnt known for action before the Spiderman movies yet the action in Spiderman 2 especially was amazing. Hell, the end action scene in District 9 by a first time director was as good as any recent action scene and that movie cost $30 million and had a lot of special effects. I could cite many more examples but I think I have made my point that you dont have to be Spielberg or Cameron to do a great action scene.