Not only is he way too fast
I get the feeeling you're probably going to be downvoted heavily just for this.
Udyr's MS boost obviously isn't nothing, but he's still one of the easiest champions to kite, and his MS boost pales in comparison to the mobility granted by a lot of other mechanics.
Compared to Ezreal - Udyr's got nothing. One of those can jump over walls every ~6 seconds.
but he also does way too much damage and is so tanky, sure his mana does go down but only in early.
Tankyness is more something that's balanced vs. Range and Mobility as a tool to survive long enough to do your job, not damage.
So we have tanky DPS, mobile DPS, and ranged DPS champions: where the tools to survive are often counter-balanced vs. one-another.
Udyr is certainly at the bottom tier of range, and his minor MS boost is easily justified compared to champions with range and mobility like Kalista, Ezreal, and LeBlanc.