A few stray thoughts about BCSL...
-I became a DT fan in 2007. SC was the first album that came out while I was a fan, and I loved it to death. Then BCSL came out and I was initially very excited for it with the long songs and all, but it didn't really stay in the rotation very long.
-The one thing that really made a huge impact then, and still does today, is the guitar solo in The Best of Times. The moment I heard it, I was completely blown away, and it remains my favorite solo to this day. I know the song as a whole gets a lot of flak, and the non-solo bits of the song I find rather mundane (though tasteful), but the solo elevates everything that comes before it and really makes it a top 10 DT track for me, the same way Intervals-Razor's Edge elevates the first three sections of 8V.
-A common sentiment about the album, one that I share, is that it has too few songs. Most albums that just have six or seven tracks have to be really consistent to work, because if you find three or even two of the tracks forgettable, the album tends to get forgotten along with them. On BCSL, we have one song out of six that doesn't aspire to be anything particularly incredible (Wither) and another that rehashes a lot of old DT sections (TSF). Nobody's going to put BCSL on to listen to either one of these, because Wither isn't a draw on its own, and most of TSF's good moments can be accessed through other 12SS songs. So right there you have two strikes. Dislike anything else (for me, I don't care for the Beautiful Agony section, the ambient break in TCOT, or the AROP instrumental, the last of which is one of my least favorite sections of DT music) and the album really starts to sink. With its share of controversial moments (MPs growls, the AROP stuff, TBOT lyrics, MY BRUTHA, etc.), the album is likely to induce many listeners to call strike three. DT is a band that moves around a lot stylistically, which means that fans from different backgrounds are likely to find something to dislike on every release (as opposed to, say, a power metal band, which releases basically the same album every time, but is always sonically consistent). Given BCSL's format, this variety works against the band more than it usually does.
-Speaking of sonic consistency, the other thing about BCSL is that, of all the albums in DT history, it's the one that sounds closest to another one. Yes, ADTOE has a lot of similarities to I & W, but 2/5 of the band turned over, not to mention 20 years in production techniques. BCSL, however, sounds like it could've been a double album with SC, because all the instruments sound almost exactly the same. It lacks an individual identity. I&W is the proggy album that started it all, and it has the '80s feel. Awake is the heavy '90s album. FII is the commercial, rock-oriented album. SFAM is SFAM. SDOIT is the experimental album. ToT is the metal album. 8V is the poppy album. SC is the modern/fantasy metal album. And BCSL is...basically SC with nonfiction lyrics. It's more concertedly epic, I suppose, but SC, with TMOLS and ITPOE, wasn't exactly coming from the 8V/DT12 conciseness model. The DT fans that do like the SC/BCSL sound (like myself) are probably more likely to go for SC, where the sound was more fresh, there was one more track, and there weren't the Wither/TSF issues described above. As much crap as SC gets, I feel like I see more "Hey, it's actually great" posts about it than I do for BCSL.
-Another issue with BCSL is that, TBOT glory excepted, it's possibly the worst DT album in terms of solos, which is unacceptable given its artistic intent. This is an album of huge, epic, modern metal tracks from a virtuostic powerhouse, and yet the three metallic opuses (ANTR, AROP, and TSF) contain very little memorable lead/solo work. The ANTR tradeoffs don't go anywhere, AROP really doesn't work at all, and the TSF solos feel tacked on and overstay their welcome. TCOT doesn't really have much soloing, either. So here you have this band that's known for the instrumental prowess, playing in a format that seems sure to especially emphasize that prowess (even by DT standards), and they come up short more often than not on that end. Of course, the instrumental issues make these longer pieces cohere less, thus hurting the flow and making the album less memorable, which becomes more of an issue due to having only a few tracks, etc.