1. She's beautiful. As of today she's probably one of the best if not the best looking model out there in my opinion and a lot of people feel similar or close to that anyhow. She even looks good without makeup. Even if we discount everything after this point the fact she just looks better than almost everybody else matters a lot.
2. She has one of the best proportioned body's I've seen.
3. Her breast are incredible.
4. She has a lot of fan interaction, and seem to appreciate her fans.
5. Unlike a lot of other people in the industry not only isn't she an airhead but you can tell she has a decent level of intelligence and is articulate.
6. She can maintain a lot of class while being in the profession she is in.
7. She always seems to have that fun personality around her that's brought out well.
8. She seems to like what she does.
Everybody that's was once on the level of where Gisele is or could have been or could be at her level is either, in the twilight of their careers and past their prime (Aria Giovanni, Anetta Keys), retired (Erica Campbell, Crissy Moran, Veronica Zemanova, Amber Evans), didn't take their career seriously, wasn't interested in being a huge star, could have been a lot bigger if they wanted to, or were happy at where they were/are at, (Leah Seres, Canice Cardinele, Jenny Poussin), let their careers go downhill by bad decisions (Sunny Leone, Kayden Kross), got old quick and lost their looks (Lucia Tovar), had the industry, hard living, going hardcore, and drugs probably take their looks away (Priya Rai), let gimmicks and surgery define their careers(Francine Dee), or is limited by being from a foreign country where they do a lot of their work(Lucy Pinder, Gemma Massey). There is also a group of people that while could be considered among the best of their generation they either couldn't get over the hump, didn’t do things quite right, didn’t quite look good enough, or didn't quite have that X factor to go from being among the best of their time to the best of all time. I would place people like Shay Laren, Jamie Hammer, Catalina Cruz, Cassia Riley, Jamie Lynn, Next Door Nikki, and how things are shaping out so far Yurizan Beltran, Bryci, and ironically enough Gisele’s OHC mates Violet and Cam with Carmen in that category also.
When all the factors are accounted for the only person I would still put ahead of Gisele is Sandee Westgate, and Sandee is Sandee, and undoubtedly the greatest adult model ever, especially when people put aside a purely personal taste and look at the whole picture. Still Gisele is younger than she is and sooner or later even Sandee will be surpassed if for no other reason that that. Unless Gisele quits, lets her body really get bad, somebody spectacular like nobody has ever seen before bust on the scene, or really makes a terrible career decision she is the heir apparent to all very greatest people listed above. Unless somebody steps up, or some new people at her level appear she doesn’t really seem to have any competition for top spot as of this time once Sandee calls it a career.