Rotating camera is a must these days, not only you can clearly see better angles but it can reveal little details that weren't visible before. If you don't implement camera rotation then your just a 3rd grade developer. Especially in an isometric setting.. For example, Solasta Crown Of The Magister demo came out with a restrictive non-rotating camera and everyone was annoyed and couple of weeks later they came up with a patch which allowed rotation. For most people, it's a game breaker and will not purchase the game without it...period.
