Germans were outraged at the Treaty - the country was in turmoil and the Kaiser had fled. People felt the Treaty had left Germany in financial ruin
In the 1920s and 1930s many people, especially in Britain and the USA, felt that Versailles had been too harsh and Germany was right to hate it
Many argue that the Treaty gave Hitler the excuse to invade other countries he needed - if the Treaty hadn't been so harsh he wouldn't have had this excuse
After WWII historians felt that Germany had actually rebuilt quickly - by 1929 it had recovered its pre-war strength - and so the treaty hadn't been as harsh as Germany had claimed at the time
Margaret Macmillan (2004) felt the treaty wasn't too harsh. Germany only ended up paying a portion of it's reparations thanks to the Young Plan set by Stresemann in 1929
Macmillan said the real problem was that the treaty wasn't properly enforced