I'll chime in.
I'm not as versed in the gazillions of RC's most Bluelighters are (I still haven't figured out how the Hell to get them, and it drives me bananas), but I'd certainly consider myself experienced. I've been tripping for a decade or so, mostly on acid, shrooms, and E (though who knows what was in the latter), but I've also managed to try DMT, DOC, 2c-e, and LSA (by means of tinctures derived from MG's and HBRW's).
By and large, I've had wonderful experiences with these chemicals. I'm not prone to negative experiences, and most of my experiences have been rather ecstatic. I stress "most."
I first tried LSA during a period where I could obtain nothing "on the streets". I secured a variety of seeds from a reputable online vendor. For whatever reason, I just didn't want to attempt a full-on extraction, so I just ground the seeds and soaked the pulp in distilled water for a few hours, shaking my potion occasionally. I strained the juice, squeezed the excess from the fibrous pulp, and drank.
There are, of course, some negative effects associated with such a simple method. Even after removing the "fur" from the Rosewoods, I found that, potent as those seeds may be, they made me quite nauseous. After a few trials, I found that I simply preferred to use the MG's, as they didn't leave me feeling nearly so sick.
I had to play with dosage a bit. The first few times I tried the stuff, I got off, though the trips were kind of mild. Still, they were very pleasant. I experienced interesting CEV's, a pleasing enhancement of color, heightened music appreciation, and a lovely body high.
After increasing the dosage a bit, I was surprised to find that these things had the potential for some real fireworks. Moderate doses offered more greatly pronounced visual distortion, wicked CEV's, bonafide synesthesia, an almost ecstasy-like body high, and considerable mindfuckery.
So I pushed further yet. One night, I made a tincture out of about 700 Flying Saucers and a few Rosewoods for good measure. I expected something grand. What I got, though, was the single most difficult experience of my psychedelic career.
During the peak of the trip (which probably lasted 7 or 8 hours), I was aurally hallucinating so intensely that I had to abandon music altogether, which was frustrating in and of itself. I mean, for the most part, music IS what I do when I trip. However, on this night, I could barely distinguish the sounds in my head from the sounds of my stereo. I couldn't even tell when records were over because of the continuous stream of sound in my head. I grew paranoid, reasoning that I might not be fit to take care of myself in the event of an emergency. Outside, I heard the sounds of urban distress: sirens, yelling, cars coming and going. I began to hear these sounds (which may or may not have been real, I don't really know) as threatening. I thought someone was going to break into my house or something. I placed a knife in each room of my house "just in case". It wasn't pretty, but I lied down and just sort of rode the thing out.
So to answer your question, no, I don't believe that LSA sucks or is ineffective. It's a powerful psychedelic if you consume enough of it. I'd also add that two of the most amazing trips I've ever taken were spawned by a combination of LSA-containing seeds and psilocybe mushrooms. I suspect that folks who've tried this combo would likely echo my endorsement. Pretty awesome.
Anyway, hope this helps in some way. Happy Trails!