The "Scourge of the Slave Lords" supermodule that included A1-A4 (as opposed to "The Slavers" suppliment in the final days of 2e) had plot railroads all over the place. One would almost think it were a Dragonlance adventure!
I probably wouldn't take away all the party's items unless a clear path exists (ie: bloody unlikely to be missed!) in the game where (1) the party gets their stuff back, or (2) the party gets new and perhaps better stuff. I'm not sure A4 even mentions if the PC's can recover their stuff or not, and the Scourge seems to delight in denuding the PC's over and over again (I know at least one case that wasn't in A1-A4...). Then along comes "Queen of the Spiders" (the logical sequel to Scourge), and it happens YET AGAIN!
I should note that clerics do NOT need to rest to recover spells, just pray at the right time of day, so it's actually possible for them to recover spells during A4! Clerics and monks (and perhaps sorcerers, if the DM doesn't go with the "PC's somehow lose all spells" railroad) have it pretty good!
In short, they're excellent adventures to play as a change of pace with characters you don't care much about yet (ie: just created). However, they are not suitable for regular campaign use unless you LIKE player mutinies (I swear some DM's do, by the way they plot railroad and persecute Lawful Good characters).