My apologies for going off topic and I'm not intending to say SE should get nerfed. I think one reason that SE seems "OP" in the department of movement speed is due to the criticality of Inner Sight, which lasts 5 minutes and has that buff to Movement Speed. From my observations, it's practically mandatory to max it for PvP. I cannot speak for DE or ME, but the speed buffs for the other classes fall under the optional spectrum in investing beyond the minimum and such investment would tend to suggest a reduction in damage or direct survivability (HP, def, void, eva, etc) of enough significance to not make the commitment. A lot of people don't seem willing to do that, especially when if they have a choice.
Investing points into Movement Speed, as least with SW and in my opinion, would require a very different approach to her usage. I heard and seen it work, but it's not for everyone.
This are all opinions, take them as you may.