Depends on usage. I had a stock 140mm Blue LED CoolerMaster fan, a $4 replacement value, that ran sweet from day 1 for over 6 years, totally quiet and pc had decent temps. But I never ran the fan faster than @ 700rpm, no need to. At its rated 1300rpm it was somewhat loud.
Should you change fans out? That's a personal decision at best. Just because a fan seems cheap isn't a quantifiable reason. Yes there are better fans, yes there are better usage fans. Would your setup benefit from higher static pressure fans because of un-removed or non-removable hdd trays or higher cfm fans because of limited airflow or a mix because of a covered fron intake.
A 'better' fan like the Noctua might be a good fit, but a 'better usage' fan will show more benefits. Quality and performance are independent of each other on a case by case basis.
There's a big difference between swapping a fan doing the job for better, and swapping a fan for a fan that'll do a better job.