I love the series and am doing a "book by book" review on my by blog following the omnibus. The first one is already up.
New Frontier is awesome but it's definitely something I can imagine sticking in the craw of those who prefer their Star Trek a little more serious. NF doesn't do serious well. The last books were incredibly dark and I dare say actually disturbing.
But yes, I love NF and wish we could have just ONNEEEEEE more book to wrap things up given everything ended on a cliffhanger.