Writer’s Digest is a great resource for Writing and getting answers to one’s question.  I think that this article really details some very good points about the disadvantages of Present Tense:

  1.  Time: Present tense restricts our ability to manipulate time.
  2.  Complex Characters: It is more difficult to create complex characters using present tense.
  3. Suspense:The present tense can diminish suspense.
  4. Trivial Distractions: The use of present tense encourages us to include trivial events that serve no plot function simply because such events would actually happen in the naturalistic sequence of time.

The Pros and Cons of Writing a Novel in Present Tense – Writer’s Digest