Well, if it didn't have mudras sure.
The problem with positionals on Nin is you're either moving during your GCD or you're losing DPS to moving. Not much, but it's there. With Ninja every 8 (with no skill speed buffs/alterations) GCDs you have a choice: Delay damage to move, skip moving, or skip mudras. Putting in 2-3 mudras uses your entire GCD on inputting 3 or 4 oGCD commands using up your entire 'movement time' space. This can be gotten around with controllers or gaming mice, but I don't think MMOs, or specific classes, should be designed around the idea that you need peripherals just to get your commands in on time, but rather should be designed around a standard keyboard and mouse set up.
And, for the record, I don't even really like Nin, and much prefer playing as monk (and honestly don't even care if Ninja ends up awful). It's just an issue I see where anyone who's not using a controller or doesn't have extra buttons on their mouse for mudras is going to have a very difficult time getting into position to hit flank/back while firing off mudras. With no other class is this an issue, as there's plenty of time to tap one button and tap E/Q to sidestep around the butt corner during a single GCD, even with lots of skill speed up. But there's not enough time to tap 3 buttons and E/Q in a single GCD. Honestly, most of the time, even hitting the three clips into your next attack's timing by a fraction of a second with animation delay and what have you.
However, with Ninja designed as they are as the only class that needs to mash half a rotation into a 2.5 (or less) second window, I think they entirely should be the one class that doesn't require positionals, as they're the only class that gets the number of oGCD button presses increased to 4 or 5 (depending on which ninjitsu you're using) by having them.
