In modern medicine, the treatment is for disease; in homeopathy the treatment is for symptoms and conditions. That means one drug treats one disease cannot be basis of the trial. so they may not have been compared well in the previous studies. Double blinded study also will be difficult because the practitioner has to see the patient. So when considering studies, have to consider these. The mode of action explained by homeopaths may be wrong, so could say it is unscientific. This story is on the results and measuring it and results can be measured scientifically.

If it is placebo effect, it will not be effective for multiple times at multiple times in same person, could say there is personal bias. There are many conditions like cold, migraine which have no definite treatment in modern mainstream medicine, so there is no harm in experimenting homeopathy when having these conditions. I believe it is better to get a diagnosis from regular doctor first and then use homeopathy.

http://www.bmj.com/content/321/7259/471 not conclusive evidence by a long way, but still.