why is it problematic?
Because they violate commonly accepted and scientific archaeological practices and rather relies on fictional archaeological work.
Archaeology
 in fact violate commonly accepted and scientific archaeological practices. It includes much fictional archaeological work
when did kingdom of the crystal skull take place The film is set in 1957. who is the protagonist of this film? Indiana Jones. what is he/she by profession? He is a fictional professor of Archaeology. can you elaborate a bit on this field of study? It is the study of human activity through the recovery and analysis of material culture. what are some of the processes or techniques used in such studies? It involves several phases like framing an objective, surveying, excavating, studying and evaluating the information collected, and finally publishing the results. is there an unethical side to this profession? Yes, it is termed as pseudoarchaeology.
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Archaeology [SEP] Pseudoarchaeology
Pseudoarchaeology is an umbrella term for all activities that falsely claim to be archaeological but in fact violate commonly accepted and scientific archaeological practices. It includes much fictional archaeological work (discussed above), as well as some actual activity. Many non-fiction authors have ignored the scientific methods of processual archaeology, or the specific critiques of it contained in post-processualism. An example of this type is the writing of Erich von Däniken. His 1968 book, "Chariots of the Gods?", together with many subsequent lesser-known works, expounds a theory of ancient contacts between human civilization on Earth and more technologically advanced extraterrestrial civilizations.