You might ask what my opinion is on brick. As a building material I hate it. As an architectural material, I often like it. I hate it as a building material because it is brittle, heavy, and hard to reinforce (sometimes impossible). This is really bad if you are in an area with seismic concerns. Brick also can look less permanent than stone, but it often looks enduring. I actually like the temples that use brick.
The temple endowment was first given in the upper assembly room of Joseph Smith's red brick store in Nauvoo, Illinois. Joseph realized that the temple wouldn't be completed before his death so he gave the ordinances to a select few there. Because of this, brick temples can remind us of where the ordinances were first given.
Original plans for the Salt Lake Temple called for it to be made from adobe, a kind of brick. This seems odd, as Brigham Young saw the temple in vision. You would think he would have insisted on the granite it was later built out of. Well, the adobe used at the time was apparently the same grey color as the temple, which makes his vision make sense. In this case, I am glad granite was chosen.
|Johannesburg South Africa Temple|
|Vernal Utah Temple|
|Copenhagen Denmark Temple|
Other temples have brick beneath the surface such as the London England Temple which, according to ldschurchtemples.com is made of reinforced concrete on a structural steel skeleton with brick walls covered in white Portland limestone.
Although not brick, other temples use CMU (Concrete masonry units) which are better known as cinder block. I used to have a bad impressing of CMU; however, they are a good building material. In most cases they should be stuccoed or otherwise covered for aesthetic reasons. I understand that the Twin Falls Temple is CMU with precast concrete panels covering the exterior. The Hamilton New Zealand Temple is also CMU and apparently just painted. I think a few others are CMU, particularly temples built in the 1970s and 1980s. In most, if not all, of these cases the CMU is covered with stone, stucco, or some other material. To be clear, CMU is not brick. Brick is clay masonry. CMU is concrete masonry. Stone masonry also exists and is what the pioneer temples are made out of.
I like that a few temples are made out of brick. I like the variety. Still, I hope this material is only occasionally used. Given the current history of brick in temples, it will probably be very rarely used and mainly used when a building is remodeled into a temple.