1 hour video ? lol
Unleashed has by far the best level-design the series ever had for modern "boost" Sonic. The levels are a blast to go through, incredibly well designed, excellent difficult curve and increasing length as well. Some the vistas are fantastic. The visuals were jaw dropping when it released. We are still stuck at the same level in terms of visuals, by the way. And this was a 360 game... Having it at 60fps on Xbox is a godsend.
There was already a pretty big quality loss in level-design in that regard in Generations. Forces is fun but level-design is non-existent. Frontiers ? Ahahah lol.
Werehog was fine, not great, not bad. Walking on beams sucked.