Someone (or multiple someones) did quite a bit of it on the wiki, if you're interested. Due to tech costs changing (as well as trees, to a large extent), it's only really valid for DL and DA, but the main thing that should stand out for you is that even under DL/DA where missiles were 75k research to beams at 49k, missiles were strictly better, and apart from psionic beams, there was no real reason to focus on the beam tree, either.
For what it's worth the primary issue that the gun tree has is that when you're using medium ships or larger, they have difficulty giving you the same weapon numbers-they're best suited to smaller hulls. Unfortunately due to the very low space amounts one has in the early game, this does not provide as much of an early game advantage as it should, and more to the point, by the time one has black hole guns researched (for example-it doesn't have to be end tree to be noticeable), there is very little if any reason to use small/tiny hulls.
The other problem with TA's weapons in my mind is that unless you are the Drengin/Korath, who get psionic beam right after Laser V, psionic beam is now barely worthy as being your evil weapon of choice, as psionic missile is available much earlier, and while evil weapons are very good in combat, their primary purpose has evolved into intimidation-where timing counts more than anything.
The point being, in DL/DA it's worthwhile to pick up psionic beam and then max out the missile tree-in TA you may as well just grab psionic missile instead; since you're already going to max out the missile tree psionic beam isn't worth the extra 8k-13k it would take.
(These are base values only, taken from adding together requisite techs in Galactopedia-TA 2.0.something brings in an additional 50% modifier to all weapons/defense techs that I have not yet thoroughly tested. But all of the above numbers are on the same scale, at least, as I have accounted for that change, galaxy size, and tech speed in none of them-they're just the raw numbers.)
