2. Neville Longbottom Wasn’t A Bad Wizard, He Just Had The Wrong Wand The Entire Time
One theory suggests that Neville did the mistake of using his father’s wand, rather than going through the process of letting the wand choose him. Which would explain the reason why he could never use it properly and his every attempt backfires and fails miserably. Eventually when the time arrived, he did get the chance to choose another one at Ollivander’s. Only this time he let the want chose him, an not the other way around.