The discussion about The quality of tracks is something that will never end on a forum, just because everyone has his his own experiance with it.
To make LGB rail come completely together you need to bend, twist the rails a little bit.
so they will properly line up. When using tracks outside it is advisable to remove all the original lgb track connectors and replace them with massoth screw on rail joiners.
When the lgb ones are removed, the dimples no longer hold the track in place, but this is no problem, it makes it easier to properly line them up. Sometimes you can get a quite big gap, then just take a baby saw and make it fit.
when you have a long track the rail can expand up to an inch, when in direct sunlight
in wintertime it can happen that you get gaps up to a 1/4 inch between some of the railjoiners. however this is normally not a problem.
On my layout a combination of lgb and usa train rail is used, they both have there own problems.
for example lgd rails uses a softer and more bendable aloy, so you can step on it when it is laying in the lawn, but it gets dirty quite quick (corrotion) usa rails is made of a harder alloy so if you step on it in the lawn the tracks can dent or twist. but they are better resistant against corrotion.
rgds Niels