Solo BL4 here as well. I'm having a blast. I never played BL3, but I enjoyed 1+2. At first it the ui and map felt a little overwhelming but after a while it's not too bad. Once you get past the first boss it gets better imo. Tbh the beginning was a little slow/boring. Give it another 10 levels and you may enjoy it!
Already refunded my copy, shouldn’t have to hit level 20 to enjoy a game