Hello and welcome to JustAnswer!
Is this something that has always been this way or is it something that suddenly started? I have been unimpressed with the low RPM power output and acceleration of this engine (especially with a manual transmission), which is why I ask. If it has been the same way since you bought it then I would say you are probably feeling something normal. If it suddenly started doing something different though then there is obviously something wrong.
I see that you have aftermarket wheels on the car. If the tires were replaced at the same time and they are larger than the originals then this will also cause a lack of low end acceleration.
What I would recommend is either have another dealer take a look at the car and see if they can find anything, or ride in another like vehicle and see if it has the same condition. If the dealer can show you that other vehicles act the same way then you know it's normal, if others won't do it then you have proven to them that there is something wrong with your car and it needs to be diagnosed properly.
The dealer gave me a loaner car to drive when my car was in service, which they had it for a week and didn't fix anything. The loaner was the same model and it drove way better. Thr problem did not start right away. I changed the tires and wheels back to the originals and that didn't help either and now the car shakes at speeds of 60+ mph. It's the worst car by far that I've ever bought. I hate it. It's only 5 months old with 4, 700 miles on it. It's under warranty but it's still a big hassle having to take it in all the time because of dealing with these problems in a car that is supposed to be brand new.