Indoor vs Outdoor, directional or not?



I was considering a Yagi with these specs for indoor use:

looks like a sword with small nipples on each side of it.

Frequency range: 2400~2500MHz
- High quality wireless network booster antenna
- Gain: 15dBi~18dBi
- Bandwidth: 100MHz
- Interface: N female
- Vertical lobe width: 23°
- Horizon lobe width: 26°
- Input impedance: 50 Ohms
- Vertical Polarization
- Max power: 50W

Will use with a usb adapter.

Then I ran into these comments, which make me wonder if Yagis
are any good indoors?

"I have great connections to hundreds(yes hundreds) of wifi
hotspots and all this is without direct visibility!; I use it
as an indoor antenna and it's not even pointed at the window
but at a brick wall :)"

and from another user:

"Other Thoughts: The cable is a bit short, but this helps
keeping the loss low. Directional antennas are not suited to
be used indoor, walls reflections usually mess things up to
the point that it will perform just as a normal
omnidirectional antenna."

Is this true, that directional antennas are no good indoors?
.



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