If you like engineering it is quite awesome. But it doesn't have much GAME in it. Plus the space setting its in gets really really old super quick. If you dislike the ship building aspect of the game (well it is the game really) you are going to be rather bored.
Much like Minecraft in a sense. If minecraft is Lego Space engineers is mechano or Kinex.
As for your computer, it does needs to be beefy when the entity count rises.
If you want to make a replica of the Starship Enterprise that actually works then you will really get a hardon for Space Engineers. If not, prepare for a lot of boring rocks in space.
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