Since their decisions are only overturned when they've definitely got it wrong, I'd say it's not exactly a bad thing that the decision is now correct?
There are still a little too many controversial caught behind/edges, but for the most part the system works well. If a batsman gets a massive inside edge onto their pad, it's only fair they're not given out. Likewise, when someone edges to first slip and it's not given out, it's good that the bowlers can get their due reward for it.
As a spinner, I also appreciate that it's tough for umpires to really judge what a ball is doing, so when you know you've bowled one that goes straight on and have hit them in front of middle, half way up the stumps I definitely like seeing them get their deserved wicket. The negative aspects of it, are a lot of players still refer marginal decisions rather than obvious clangers.