I feel as if blitz's overcharge should be a ramp up rather than a ramp down
It just doesn't feel right at all. You move fast at the start and then you pretty much move slow as heck after a second. You also don't even really feel the attack speed buff anymore either.
So I think that his W should be a ramp up. Start off slow and move faster. Make the duration say one second shorter because it's ramping up now and also make the attack speed buff last slightly longer (say 2 seconds). I really like the idea behind it but I don't think its been implemented properly.