Hardly, the X bullet was brought to market way too hastily and did not receive sufficient testing. The damage it's done to the reputation of mono-metals is enormous even though as you say, most of the issues have now been addressed. Barnes definitely lead the way with a commercial version of a mono-metal but I'd say other manufacturers have now brought even further innovations to the mono-metal and Barnes is playing a bit of catch up.
I'd whole-heartedly agree with Boomer that the criticism of the original X bullet is harsh, along with the above comment as well. I guess we should say the same thing then about the Nosler Partition? One was doing well to keep the original ones on a pie plate at 100 yards - but they got better - WAY better.
Randy Brooks did the hunting world a great service with the introduction of the X bullet, and we all owe him a great debt of gratitude - he and Barnes Bullets forced all the competition to play catch-up. I've been using them since they first came out, and have had nothing but spectacular performance with them. Yeah, the original one's fouled
some barrels, and didn't shoot all that well in
some rifles, but then one can say exactly the same for any rifle and bullet combo, past or present. I have some rifles that don't shoot certain brands or weights of bullets that great - well guess what, I try a different combination.
I continue to use some original Barnes X's that I still have, along with TSX's/TTSX's, Nosler Partition/Accubond/BT, Sierra GameKing, Norma Oryx, etc, etc, etc. They're all good, and saying that Barnes damaged the reputation of mono-metals is a little over-the-top.