Hi there,
I myself am not tall but we do have someone in the dojo who is 1.93 meters (I think it's about 6.5?). He is a black belt and I don't think his hieght had ever interfered with his training. usually for men, their natural strength comes more of a problem than anything else. Since useing it is so natural, they have a hard time learning how to stop
.
You might have some problems in the begining since you are still not used to the techniques etc. But don't let it get you down. If your sensei is good, he will teach you to deal with situations (if he is good he will also let you frustrate over some cases, to let you teach yourself, your body, what is right for it
).
I say Aikido is good for everyone, as long as they want to learn it, since it is a MA that doesn't require any begining shape, size, strength...
Hope you enjoy your training and good luck!
Anat