Its current stats are:
HP: 75
Attack: 75
Defense: 55
Special Attack: 105
Special Defense: 85
Speed: 30
Megas only add 100 to a Pokemon's BST and they don't change HP. Most of those 100 points will have to go into that atrocious speed stat to make it good. Even if they min-max like they did with Mega Beedrill and lower its attack stat, it still has really shitty defenses and a shitty defensive type.