Actually, they have rather sophisticated technology based on -- surprise! -- plants.
Examples include seed pod mortars, a seed pod elevator in the capital, use of luminous plants for lighting, plants that make draughts which grant buffs, roots that, er, root and so on. There's a surprisingly wide range of Sylvari technology, all based on the plant theme.
Where the Asura are heavy into inorganic tech, the Sylvari are into biotech.
Anyway, I know this is a Charr thread, and a thread about Charr not getting the love, no less, but I thought I would mention it.
Never thought of it that way, cool.
If you read the quote that I took from you, you said "They are also the second most intelligent race in all of Tyria, and have technology superior then that of Norn, Sylvari, and Asura". I guess that you accidentially wrote Asura there then.
Either way, I can't really comment on this as I never played GW1 (and thus I can't know about the technology that the Charr used there). I can point out, however, that whether somebody succeeds in technological process isn't always a good way to measure his intelligence. I am purely playing a guessing game here, but it could be that due to the troubles that humans had to face during the 200-250 years, they would not have had the resources to develope their technology as fast as the Charr who were having some sort of a golden age while they claimed back their old lands.
As for the Sylvari, it is true that the fact that they are plants and they love nature doesn't mean that they hate technology. But you said it yourself. It could be that they haven't had time to create any. This hardly means that they are less intelligent than the Charr as you can't buy more time with intelligence, can you?
Accidently typed Asura sorry.
As stated they HAVE bio-tech and remember, Sylvari haveant really found what they want to be yet, who knows, maybe in a hundred years they will have space ships. :3
Also, in the original Guild Wars they had little to no technology.
Finnaly, I take back that they are "smarter" yet I do not accept that any other race has a more superior intellect, or agility. (except for Asura).