I don't even bother trying to call either one of them anymore. I don't know if they are bugged or what. Durnehviir doesn't even show up. When Odahviing shows up he just flies around like a moron and then flies away. When he actually blows fire on another Dragon it doesnt even seem to help much at all. I'm thinking of getting the mod for them, but I'm not sure if I should even bother.

Maybe I should stick with using Dragonrend over and over. Problem is sometimes the dragon lands too far way and starts fighting a wolf or something, by the time I run all the way over there, the dragon is already flying again.

Maybe this will help: http://www.nexusmods.com/skyrim/mods/37738/?

I have no such problem with dragonrend. If you shout it from a particular area he will always land in the same place. When I reach the dragon I use the shout again (just before he takes off) and wait there for him to land once more.

Dragon's, in all accounts, were a definite blunder in this game. Especially disheartening considering this game is centered around them.

But Durnehviir teaches you an awesome shout, Soul Tear. So that's cool.