Is nikon camera easy to use?

http://gadgets-review.com/slr/

Easy if you play it as amateur

Define "easy".

The first time I drove, having never been behind the wheel of a car before, it was not "easy".
The first time I made a solar generator, having not connected a solar panel to a controller, battery, power inverter and various other things, it was not "easy".

If you have not used a dSLR before and not read through the camera's manual, it can be challenging. If you set everything to "automatic" mode, charge the battery and use/insert a memory card that is appropriate for the camera, and use the camera under environmental conditions for which the camera is designed (read the manual), then, sure:
1) Turn on camera.
2) Point lens in the direction of the subject.
3) Fully press shutter release button to capture the image.

If you want to do more with different lenses, capture stills under poor lighting conditions, add a flash unit, capture video, adjust focus for interesting depth of field, capture fast moving action and freeze it or let the motion cause a blur, then using the manual controls can be as easy or difficult as you want it to be.

Yes

Yes, I have one.they're great.

If you set it to auto or program mode, it is easy, but you won't be getting the most from the camera.

If you want the best out of the camera, it takes skill which means learning about terminology, camera operation, lighting, and composition. Learning the mechanics is fairly straight forward. Learning about lighting and composition requires effort.

Sure

It's probably been at least 10 years since I've even held a Nikon in my hand, so take my opinion with a large grain of salt.

What I remember with Nikon DSLRs is that they are easy to use only if you thoroughly read through the owner's manual. I remember Nikon DSLRs not to be so well engineered and designed so that you can just pick it up and start using it easily without any prior experience with Nikon DSLRs.

Canon DSLRs are a bit easier and Pentax DSLRs are extremely well designed with most reviews stating that you don't even need to read the manual. Of course, I'm sure you're not buying a camera just based on how easy it's to use.

Any camera will be easy to use once you've read through the owner's manual and used the camera for some time. My advise is that you go to a store and put one in your hands. Try to change the exposure modes - PASM. Try to change the ISO settings. Try to change modes from JPG to RAW.

All of these settings are going to be very easy to get to and adjust after using the camera for a little while. So I wouldn't really worry about how easy or hard the camera is going to be. That's not to say you shouldn't be aware of frustrating mode settings, if they exist. From what I hear, Sony's menu system is among the worst, but that hasn't prevented a lot of Canon/Nikon users from switching to Sony mirrorless cameras.

Like any DSLR, you get back what you put in.

Use it as a glorified compact, it's very easy to use, but your results will be uninspired.

Put in the time and effort to learn to get the best out of it, and you'll overcome any difficulty with controls and settings.

Yes, if you KNOW what you're doing, and moreso if you've ever taken an organized Beginners' Photography Class, at the very least. Do you understand the Photography jargon? IF SO, then reading through the camera's Instructions Manual will be a cinch, and you'll know where to find the necessary features, functions and options necessary to control the exposure of almost any photo you're taking in almost any lighting situation for best results… But that also applies to any other camera brand. Don't pay attention to naysayers who obviously use other brand cameras, and feel a compulsion to denigrate ANY camera brand but the one they use. In today's modern world, all comparably priced DSLRs are good, but the most expensive, the most sophisticated or the "most bestest" [sic] camera won't help make anyone a better photographer. Being a good or great photographer will depend on the individual's personal skills, talents, creativity, experiences and accumulated knowledge, and to be honest, that takes time, usually years.

Like any high end device, it takes considerable time and experience.