Let's not say they are not good track gloves, let's just say they aren't good crash gloves. They are better than nothing but personally, I wouldn't wear them at all. I've crashed many times and hands are the most vulnerable part and need good protection.
Little quick story I'll share. Two seasons ago one of my very good friends was going to look at a job he was bidding on as a contractor. Warm summer day so he decided he would ride his Honda VFR. Put on his jacket and gloves about like yours and off he went. On his way home he hit a deer at 60 mph. Both gloves were distroyed and his hands were a mess. He had all ten fingers bandaged looking like two big clubs. He couldn't feed himself, bath himself, couldn't wipe his a$$, couldn't put his pants on, shoes on, couldn't take a piss without his wife doing the dirty work. Things like this happen when your hands aren't properly protected. When both hands are useless, you are totally helpless.
I'd take those gloves back and get a better pair!