If you want to test out your bass parts but don't have a bass guitar, you could always try the "emulate bass" option. It allows you to play the bass parts using a regular 6 string guitar. It doesn't sound nearly as good as a real bass but at least it would give you an idea on how accurate the part is before you release it. Personally it bugs me a bit when bass parts are obviously wrong but I wouldn't ever complain about it. If anything I'd offer suggestions. Those who complain and post negatively are simply ungrateful. And yes, never trust the bass tabs you find online. They are never right.