No, it had pretty good word of mouth on those last few episodes from what I remember. The whole seventh season of The Shield was basically one of the best seasons of TV and had tons of bang, compare it to the last season of The Wire if you want to see a show that mellows down to tie up everything. I've never heard anyone be disappointed by how everything ended up on The Shield's finale.
Anyways, I thought BBs finale was just about perfect.
Only a small thing bothered me; the lasers would be diffracted at least a few degrees off when going through those thick windows. So the "guns" weren't pointed directly at their hearts. You would think maybe some super scientists would remember this stuff but Walt just knew his poker face was too good for them to pay attention.
Also this show totally would make crippled people feel unappreciated. Between Hank, Tio, and Junior, only the most clueless one...Flynn lives. Lawl.