How good is Vista? Brad Wardell said it's pretty good, much better than XP. However, he also listed five mistakes of Vista. 1) UAC (User Account Control). User Account Control is an important feature of Vista. Some casual users may feel that more prompts make Vista secure. Power users, however, think that they are prompted too often, so they will turn off this user account control. This negates the purpose of achieving better security through user account control.