Is 5x8 Rug Too Small

Design by kristen hutchins via hgtv.
Is 5x8 rug too small. The rug is 5x8. Just got the area rug that i like but i am wondering about the size. Or if a 5x8 is actually too small for my space. Here are a bunch of pretty rooms that they ve tried to convince us have big enough rugs.
A 5x8 rug can go in front of your sofa with no furniture going on it but then larger sized rugs are best practiced to have the front legs of your furniture on the rug. It might be worth buying the higher end rug in a 5 8 and layering it over a much less expensive 8 10 neutral fiber rug. The size of an area rug can dramatically alter the room s overall effect. Almost any rug that feels just a bit too small can be stretched into service with a layer beneath that s at least a bit larger.
The salesperson thought 8x10 would be too big in the room but this feels too small. So i wondering if my eyes were just used to the bigger coverage. A rug that is too small for your space can cause the room to feel uninviting. A rug in a living room should really ground the whole seating around it tells everyone that this is where the conversation is this is the focal point of the room and a too small rug makes it feel disjointed and really just cheapens everything.
We are switching the sectional out with an 88 couch. The right sized area rug will bring warmth and balance to the room creating the perfect finishing touch.