Visually, It's not very appealing or enticing to the guest who may register and gain some wisdom from the content you are holding or may hold in the future. I would suggest you give the style a facelift and more importantly the images that compliment the style a change to something that fits to theme and at the same time compliments what your theme conveys across to the community.
The logo doesn't look crisp and I assume you've went for a "text on path" type effect to give it some perspective which I'm sorry to say doesn't look that great. The logo should always be clear with tidiness in mind that members can look at and know what type of site they are visiting.
The forum Status Icons don't really match the mobile theme and I would go with something that is consistent in what your providing. There's alot of free stock mobile phone icons that I'm sure would fit better than the current lot which don't really go to well.
The buttons look nice though the text that sits on some of them have alignment issues (they are to the far right). Maybe shift them over to the left so they look a little more centralized and give a little uniformity.
I noticed you still have a few stock vbulletin images still lurking on your forum which I personally feel should be changed for custom images.
Overall, the feeling I get is an unfinished style with images that need re-worked & changed.
Goodluck with your site.
