I'll agree that Thelo are not as mobile, but this is once again an argument that ignores the strengths. The natural bonus to resists are huge and range is ans extremely useful tool even if it's not always available due to LOS...
I've been having a similar problem with Nuimqol bots (which I've always piloted). It really bothers me that even after bonuses to rep amount... Thelo bots make better active tanks due to the natural resist bonuses that they start with... truth is without a heavy speed advantage, Kain survivability drops to zero since they need to get in close to fire, before running away... I personally think the poor range and terrible defense makes the slower Mesmer useless, and I've yet to actually see a single one in PvP. On the other hand the Seth might be slow as all heck but in a defensive role can tank like nobodies business and presumably has the range advantage since the defenders set themselves up on the high ground in advance.
So where you expect the Thelo to be a master of range... it's actually best played as a tank (range is just an occasional side bonus, VERY handy with the ewar you decide to ignore)
Where I expected Nuim to be tanks... they're actually best played as hit and run raiders (bonus to rep amt is a side bonus that lets me get back into the action sooner)
Any adjustments to speed... other bots up or Kains down will COMPLETELY cripple us, since after getting into close range to fire, our ONLY viable defense is to run back out of range to rep up before attacking again.... As for Mesmers, if you know any viable roles for them let me know.
"You're living in a parallel universe." ~Syndic