It was underpowered, had less range than the SBD and bad flying characteristics, most of the issues were fixed with the later models. By the time they entered service in larger numbers the tide had already turned so it never had a chance to shine. The SBD was not any uber plane but it was a simple, reliable aircraft capable of doing the job when it was most needed. The Swordfish and the Hurricane are 2 other planes in that category.
The helldiver would be a nice add to the game but still, "faster than the SBD" doesnt really mean anything, the helldiver would be a turkey shoot for pretty much every fighter just like the other dive bombers.