I would say Lalo's death, in spite of being yes a bit anticlimactic, was still better than Mike's in BrBa, the weakest "big" scene on that show. Having Walt stomp across the screen in the wrong direction like Wile E. Coyote to go shoot Mike over a minor tiff was pretty lame.
I think Mike was fleshed out a bit nicely in BCS, though I can understand why someone else wouldn't think so. It's interesting how Mike seems like he knows how to do everything right in so many situations and yet gets knocked on his ass so many times.
It's possible that I've concentrated too much on the BrBa-like aspects of BCS altogether, much of the acclaim of the show is after all about Jimmy's non-BrBa-related adventures.