Why not? I have dahuas running for around 4 years or so now......no issues...the cameras may have lasted 10 years, but you also settled for low quality resolution and compression for the last 5 years...you could have easily replaced the china cameras many times over with better technology for the cost of the axis camera.
Well, because I tried a few, some for 1 or 2 years max and saw the components inside often low quality or bad electronic design but sometime it's only the power supply that is bad so you just have to replace it...
Also firmwares use to be full of bug, unstable, lag, motion detection and alert feature bearly usable, interface showing "generic" features that do not fit to camera's model, for example you a camera that exists in différent version with/without audio, with/without SDCard will show audio and internal storage useless features on the camera that do not have any audio nor SDCard.
Chinese tech support are also awfull, low skilled, firmware updates are rare.
Also security is a joke, many hole, uncrypted streaming including login/pass (whenever they ask for some !), including P2P feature ! with "clear" UDP packets.
This is why you should NEVER expose those camera directly on internet but use some NVR (with good security level, again you have low priced NVR and "pro") or some rather cheap but efficient software like
Blue Iris or Netcam Studio.
Also those cameras have a lot of difficulties to handle mixed light/shadow situations that's also a problem and HDR/WDR feature is useless.
Last example is ESCam QD900 FullHD (I bought two of them with good discount 45€ each), supposed to be "professional camera" according to their website, piece of joke, but for the price its OK i'll not ask for refund.
Talking about resolution, those old Axis are VGA only yes, but depending usage it's enought and talking about stream compression, yes it's MJPEG but VGA do not need H.264 ;-)
But I am not Axis addict ! today the IPCam market increased a lot (thanks to those low priced chinese camera) but low price and good quality still do not match you get what you pay not expecting too much, they are not Axis or Mobotix but for some situations I can accept that and chinese products are low also because they do not spend to much money for firmware/software engineering.
Also a new market appeared that I called "bling bling design connected cameras" with rather high price, easy to setup, nice design, nearly zero config and "in the cloud" storage, I have not tested such camera for now but all those "cloud" features are dangerous and terms of usage are not clear about security/confidentiality, how data are stored, who can access them...
But I also like chinese cameras because they are very low priced so you can play a lot with them, hack them to add new features with no fear, the best example is the excellent (for the price) Top-201 "ELP" camera

and I think I will learn a lot reading this forum (alreday learned lot of trick about TOP-201) and may be discover some "chinese pearls" !
By the way you say you do have Dahuas cemaras but I don't think this constructor produce low level quality "chinese" products.