I am writing this after extensive testing, reading lot of forums on K2 ...
K2 first of all is excellent... you may ask then whats your problem?
problem that I am going to list is faced by everyone using K2...
1. Search - complete failure...
- cant search by tags.
- cant search by category.
- cant search by username.
- above all when there is no search result just displays a empty page.(most irritating thing for any user).
2. Multiple Extra field for single category.
this will be helpful to add rich details to products. right now its not there in k2.
(Eg.. if I am building a stock image site , then I will publish an image (photograph) and add extra fields like
Extra Field 1: Image Formats - jpg, tga, gif
Extra Field 2: License - Commercial, Non-Commercial.)
3. when the tags are clicked it filters the articles by tags, but the tag is not associated with any itemid, so the results are displayed on page where the modules disappear.
4. Ability to include items in multiple categories.
5. mod_k2_content - it will be nice if included different display formats. ability to display the items in table format.
still testing...