Well, Actually they could have it done with more finesse. Well they should have sent a whole bunch of rpgs at Obi Wan instead of one, ince rpg might be a bit better with no saber deflection(though force push would work) Obviously a mix of rpg and sniper simotaneous attack would have solved the problem. Though obviously a too perfect 66 scheme on survivable characters would be bad.
As for yoda, at least they should have given the effort to use sniper rifles. It is ok if they get deflect killed, but it would make both clones and yoda look cooler.
As for Vos, that is a more reasonable one, I mean they try to search and kill him carefully.
Secura... what a waste of a hot twi'lek body, they should have used a more gentle way of termination, so did offee.