I've been considering applying, but I'm not sure if I have good enough commentary quality. Or popularity for that matter.
Confidence is not only important when you apply, it's also important when you record. it comes across in your performance in the game, as well as how you conduct yourself.
From some of your vids, you seem nervous and hesitant to speak. You need to entice the viewer into watching your videos.
Your game choice is also not very unique. We want directors who give the site what it doesn't already have. We realize you have to do what's comfortable to you, but we also want variety. Look for requests and games we haven't already got recordings of.
Also, you might want to look at your audio and video recording settings. You are getting some static in your videos when you speak. Usually, this is caused by mic sensitivity being too high. Usually happens when there is a spike in the audio levels.
Hopefully you get the confidence you need, but take my tips to the table and see how you can help yourself get better if you are doubting your performance.