But like the man says: there are downsides to 'free' in terms of limited feature set and non-intuitive user interfaces.
I'm a long time Adobe Premiere user, and it's rated as among the best - if not the best - video editing packages. However, the full version costs several hundred quid.
The good news is that there is also Adobe Premiere Elements. I don't know it personally, but if it's anything like Adobe Photoshop Elements, it contains around 80% of the functionality (which is more than enough for most users) for less than 10% of the price.
Take a look for it on eBay: it looks like there are some bargains to be had.