In every field of knowledge, reasonable persons follow the highly knowledgeable experts in that field. It is the logic of life that the less knowing must refer to the most knowing. It is in medicine, engineering, law, etc and no one objects on it at all. Why some people doubt it when it comes to religious knowledge? This doubt is illogical. Allah is Quran ordered to refer to those who are more knowledgeable.(Sura Al-Nahl, verse 43 and Sura Al-Angiaa', verse 7 and Sura Faaturm verse 14).
Following the verdict of the Marje' is the way for people to follow the authentic evidence derived by the highly learned experts in Islamic knowledge. Those who doubt Taqleed do not have any other way to know the evidence because they themselves are not experts in Islamic knowledge. Some of them follow less knowledgeable persons instead of following more knowledgeable which is type of injustice.
Wassalam.