Editing: Using Photoshop - Pros and Cons

Recently, I mentioned briefly that I may try to use Photoshop in order to obtain a more visual appealing music video. Before I commit to this approach, I decided to test this out on a small piece of footage and draw up a list of pros and cons.
Pros
As I am a photography student, I am able to use the software's many functions to a decent standard. This means that the editing process, regarding colour, contrast and effects rather than cuts, will be more flexible, and the results would, in theory, be of a higher quality.

When attempting to edit the video clip in Photoshop, I managed to take a screen grab which we may use for our digipak. Below is said image.

Cons
After I exported the clip and put it into Photoshop, I discovered that the video had become slightly pixelated. This would only increase once I export it again to get it back into Final Cut Express. The quality will worsen once again once we export the music video as a whole.
Using this method is very time consuming, and we may not have enough to edit all the clips we want to in this way.