No, the drop kicks are not fine. They do stupid damage, use no meter, set up more combos, can combo into each other, can combo after a CD counter, have anywhere juggle and have invincibility to go through anything (which means its very dangerous to zone him with fireballs etc). Aside from that BS they are also in the arsenal of a grappler, so, while the opponent is busy trying to avoid and bait drop kicks, which often times results in turtling and holding back, Raiden gets ample opportunities to get his grab and grab super on.