The LSA/LSH thing with peppermint seems extraordinarily unlikely, from the perspective of chemistry. If there is a real effect from it, i'm inclined to suspect that it is due to some other unexpected synergy, rather than the LSA reacting with compounds present in trace amounts in peppermint oil to produce some new compound.
LSA is certainly an active compound, and it will make you trip, but it's not nearly as clean as any other typical psychedelic in common use, and the other crap in the seeds just makes things worse. It's main appeal is that it is cheap and legal. I can't blame someone who has access to better psychedelics for calling seeds "crap", especially if they are one of the unlucky ones that gets bad body load from the seeds. About 50% of my friends get body loads on seeds that overpower the psychedelic effects (little to no psychedelic effects, nausea, vomiting, generally feeling like shit), and nobody I know who has access to LSD, shrooms, or RC psychedelics has interest in seeds, even if they liked them before getting access to better psychedelics.
First of all, the statement "x is a better psychedelic than y" is virtually meaningless in that it glazes over a wealth of assumptions that need to be made explicit. Intentions, desires, preconceptions, methods, set/setting, and individual constitution are all variables that cannot be ignored in the (e)valuation of an entheogenic or hallucinogenic compound. One can say, meaningfully, that "I like x better than y" but to try to draw that statement out into objectivity is difficult, and, well, rather a useless waste of time and thought-effort.
LSA has an extremely LOW recreational value. To give you an idea of where I'm coming from, I would consider low-dose LSD trips to have among the highest recreational value of any of the psychedelics. Mushrooms are up there, but slightly less so, especially at higher doses. So, if the intent of user is for a recreational "trippy" experience, LSA is going to be a very, very bad choice, cheapness/availability aside.
Why is this? At low doses LSA is sufficient for therapeutic use (discovering root causes of emotional issues; increase in introspection and openness; a tendency toward personal revelations) and the treatment of cluster headaches. At high doses, LSA is a mindfuck comparable to 5g+ of mushrooms. You would not want this state of mind unless you're a psychonaut trying to find the meaning of life. Time distortion, uncovering repressed memories, audio/visual hallucinations, ego-death and a feeling of cosmic "oneness" are all common. Generally, people looking for these states are willing to put up with nausea etc. as a part of the effort necessary to reach these states.
Morning Glory/HWBR seeds are, in short, a shamanic tool/medicine, not a recreational drug. IF ONE DESIRES TO USE LSA OUTSIDE OF THE SHAMANIC CONTEXT/TRADITION, ONE
MUST EXTRACT THE COMPOUND FROM THE SEED-MATTER!! I cannot stress this enough. 80% of the people to whom I have administered Morning Glory seeds in shamanic rituals VOMIT the seeds up at some point in the trip. This is not an entirely unintended or unanticipated aspect of a shamanic seed consumption, especially large amounts, as one can easily absorb the majority of the active compounds if they wait an hour or two before vomiting. This purging is part of a ritualistic death-rebirth cleansing symbolism involved in the shamanic tradition. Now, the remaining 20% of those people have what I call a "shamanic constitution" which means they are a) proficient at receiving and interpreting messages from the subconscious (or "spirit world") accurately and b) have the fortitude and inner harmony necessary to mediate between a strong mental trip while physically merging with the plant world. This dualism creates a "Third Discourse" wherein most of the spiritual work is done.
So, if someone says "LSA is crap" it generally means they have used LSA in a context/method inappropriate for their intentions and/or individual constitution.