Sure. Anything can be screwed up. But as a machining process, installing a sleeve is about as simple as it can get. Most sleeves are better material than the block itself.
I have sleeved entire V-8's, inline 4 and 6's and can't count how many blocks I've saved that needed a sleeve and someone else would have junked it. One comes to mind. It was an FE ford that had cross bolted mains. I forget what it was, but it was a hard block to get. Several machine shops said it was junk because it had thrown a rod and the damn thing knocked a hole in the bore the size of a golf ball. The odd thing was the rod went right out the core plug hole and there was zero other damage. I ordered a thick wall sleeve and saved that from an early death.
Done correctly you'd be hard pressed to even notice it's been sleeved.
