Because the fact that it might miss doesn't take away from the fact that it can attempt in the first place. It can survive attempts that would kill the vast majority of allied tanks and reach further then them as well. Not to mention DPS doesn't matter as much if you are chasing already damaged tanks.
explain how a tank that always misses and shoots slow like a turtle is good at diving?
You can mention it's weaknesses all you want, it doesn't make it's substantial strengths disappear.