I'm really pleased with Gwenview, it has awesome interface plus strong plugins that allow really powerful and fast tasks to be done fast.
Only thing I'm missing is straightening of images, I need to jump into Shotwell viewer to acomplish that task.

Is there a straighten tool in the plans?

Cheers,
Valent.

To see if anyone else has requested this, you might want to search in the Brainstorm (on this forum) or on Bugzilla, where wishlist bugs are tracked for some products.