I just remember massive state being injected into forms, and it wasn't pretty, was massive at times and just unpleasant regarding WebForms. It was fine for internal apps with a network connection, the experience was horrible if you were a dialup user. Especially in components that a change triggered effectively a full server round trip to update the whole page.

It got better by ASP.Net 3, but MVC/Razor was much, much better imo.