What do you mean by entry level?
Do you mean by low price? Some people define entry level or beginner level by price alone. DD is not the most expensive, but they are priced higher than many other manufacturers. If price is not an object, then DD could be considered entry level.
Do you mean by operating features? ARs have a number os features inherent to the design. Some companies install additional doodads (like rails, and ambi bolt releases and magazine releases). Some of these doodads may be attractive to you or you may consider them to be required features. Most manufacturers offer models with different doodads added on. Usually I suggest that someone new to ARs buy a KISS weapon, and learn to shoot it effectively, adding on the doodads that he/she discovers might be benefits for the mission.
Do you mean by material quality and assembly quality? While all ARs are supposed to be dimensional the same, and built to a minimum quality standard, many are not. Parts may be MIM (metal injected molding), cast, forged, or machined. The problem is not in the type of manufacture, it's in the quality of the materials, and production QC. The first AR I build was a parts kit from the infamous Nessard (Nessard is now closed), but the same family that operated it now operates several known AR parts and build companies Model 1 Sales is one of them. I would not own another gun from that companiy or any of it's offspring. Some military surplus parts were supplied in the kit. US military surplus parts were rusty, and worn. The new commercial parts that were supplied were out of spec dimensionally, had poor finishing (bad color match), parts were improperly assembled (bolt assembly missing the rubber insert on the extractor spring), and were made of inferior materials (metal parts were too soft (extractor, hammer, trigger, and bolt cam pin), and were wearing rapidly when I got rid of the gun).
DD guns are GTG. If you can afford to buy one as your first AR or to learn to shoot, you won't be disappointed with the gun, but with all skills you will need to practice to become competent with it.
If you are asking if there are other guns that might be fine for a beginner (entry level), I'd say go with PSA. PSA guns are 1/2 the price of DD guns, and you will get about the same level of quality. In any fad (including guns), the name on the side (flavor of the month) always bumps the selling price up over that of other less well know names. PSA is a newer brand name, gathering critical mass, and bursting onto the mainstage this year on the way up as a supplier, it's where (Bushmaster, OLY, DPMS, RR, DD, LMT, BCM, Stag, Colt, Eagle Arms, Armalite, and others were/are at different times).