"Breathtaking scale" refers to something that is extremely impressive and awe-inspiring in terms of its size or magnitude. It describes something that is so large or grand that it takes your breath away. Full definition
• Designed For The Next Generation of Gaming — With breathtaking scale and the new freedoms of tactical gameplay, Killzone: Shadow Fall is a true showcase for the impressive power of PS4. (impulsegamer.com)
The backdrops and visas remind one of Avatar but to a much more breathtaking scale. (seligfilmnews.com)
This startling reimagining of God of War deconstructs the core elements that defined the series — satisfying combat breathtaking scale and a powerful narrative — and fuses them anew. (wccftech.com)