Your home made wine can turn out just as good as a commercial version. There are no tricks that the big guys use that we home makers can't utilize. Yes of course they have more experience and have practiced the "art" more, but with experience and experimentation, so can you.
Also, their grapes may come from a much better source - that makes all the difference in the world. However, if you could get the same grapes from the same vineyards, you should be able to make a really nice wine, too. You can pay over $250 for 5 gallons of frozen grapes from Brehm's; that makes about 15 bottles. If you know what you are doing and really want (can afford) to make great wine.
One thing that separates commercial reds from most home made is the utilization of oak barrels in bulk aging. Well, you can buy 6 gallon or 15 gallon oak barrels and barrel age along with the best of them.
Much of of the grape wine made at home is made from kits, which mostly utilize grape concentrate. The cheaper the kit the more concentrated is the juice. Red kits don't typically make as rich (mouth feel) a wine as fresh or frozen crushed grapes, but you, too, can make homemade wine from crushed grapes.
So, maybe the wine you tasted was too young to be drank. Young wine can taste tart and totally out of character. (How old was the wine you tasted?) I made an amorone from a kit; for the first year and a half, it tasted really bad and seemed without hope of ever coming around.. but it did and now I am glad I didn't give up on it.
Maybe it was from inexpensive kits. Under normal circumstances, a $75, 30-bottle kit will not make as good a wine as a $225, 30-bottle kit of the same varietal.
Maybe what you tasted was over sulfited.
When it comes to fruit wines, I can't imagine why yours wouldn't be just as good as any commercially available. Again, what you put in makes a big difference.
If possible, join a local wine making club. At most gatherings, the members will have bottles of their best. Always ask how old the wine is and from where the must came. They will give you a better idea of what you might make at home. Just don't be surprised if some of it is too young to drink; sometimes we home wine makers get in too big a hurry to drink our wine.