There's some good stuff in MC. Maybe its best to just focus on *how* to accomplish something rather than premature judgement...
So...
There are MANY ways to add to playlists. Let's start with these:
1) Right click the tracks you want, and Send to > Playlist > ...
2) Open a new tab and set it to the Playlists section of the tree. Now, switch to a tab that contains your tracklist, and drag to the Playlists tab, which will then open/expand the Playlists tree, where you can now drop to a playlist. The + indicator will be your guide that the drag will succeed.
3) Drag your track selection to the drag and down to Playlists and it will auto-open, and drop on the playlist.
4) Right-click a playlist and then select Edit Playlist in Action Window. This will open a window where you can drag-n-drop, reorder, etc.