1st 6 reallocated sectors - Up to your own comfort level, but the drive is 7 years old
2nd 134 uncorrectable errors - toss it
3rd 360 CRC errors. That's caused by bad / loose sata cabling, if it doesn't increase, then don't worry about it.
You can acknowledge the thumbs down by clicking on it, then you'll be notified if those attributes increase in the future