but i surely hope they send on a patch or new release to improve the performance - Otherwise this will be my last Acura
This will almost certainly not happen. It's important to know what you're buying before buying it so you can make an appropriate decision you can be happy with. If you're as bothered by the Nav as you stated in your post you should have never purchased this vehicle in the first place after 'test driving' the Nav/infotainment. You can't assume that because you liked a particular feature/function on a different vehicle by Acura years ago, you'll always like the similar function/feature for any vehicles they build since then.
My own opinion based on a 2014 MDX Tech - the Nav could certainly be improved but it performs the basic functionality of putting a map in a nice big display that's not a distracting kludge like a phone stuck somewhere, it can do routing, and it can do a few other things. I don't think it's good at all at voice recognition, so much for the 'hands-off' they were trying to achieve, and every now and then it just does something strange, like dial the phone rather than find a motel.
Regardless, the Nav to me isn't the main reason I bought the vehicle - I bought it mostly due to the handling, power, size, price point, mileage, etc. and for the relatively few times I actually use the nav (for >90% of driving I don't need it - I know where I'm going), it somewhat works okay for me.
All that said - I agree it's a pain that the manufacturers don't handle their nav/apps like a smart phone or PC does with 'free' updates and improvements as time marches on - but I knew they didn't when I bought it and bought it anyway so I'm not going to get irate at Acura for something that was ultimately my own decision.
Again - make sure you know what you're buying before buying it. This is especially true for Nav/infotainment since offerings from almost every vehicle manufacturers receive complaints and dissatisfaction in this area.