Incorporate context-sensitive sentiment analysis: Currently, the totalsentiment method might assign the same weight to every word. However, the sentiment of a word can change depending on the context.
Utilize external sentiment lexicons and databases: While a custom sentiment dictionary is good, it might miss out on subtle nuances or domain-specific sentiment.
Consider the review's target and purpose: The sentiment of a review might depend on its target and purpose. We can incorporate factors like review category and target type to adjust the expected sentiment range and weigh the words accordingly. This would prevent comparing apples to oranges and lead to more realistic ratings for different domains.