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Is your issue with simple products or configurable products?
I’m having the same problem with importing some configurable products. While most configurable products have imported successfully, a few of them are not showing up in the catalog.
This may be due to some product image uploading file size. In coding there might be some issues which have some conditions which shows up that file can be uploaded but cant be viewed above this file size.
How do you guys import your products? I use automated services and don’t bother about errors. i import products from csv file and update catalogue weekly. everything is done accurately. check this for example: www.file2cart.com - might be helpful.