Enchanter will get you into groups a lot better than being a Necromancer will, which is useful if you ever want to switch it up.
However, that said, you can still be a very effective Necromancer in groups, you just need to adjust your play style, and know that if you are a good Group Necro, you're fighting against a server of players who have bad experience after bad experience with Necromancers in groups, who see us as a waste. So, while you can be great in a group, you're always going to have to prove that you're one of the better ones.
Necros can solo a good bit of stuff. Shamans, IIRC, become the best soloers in Velious, but Enchanter/Necro is definitely up in the air between. Enchanter is able to break larger rooms easier, with mez and all that fun stuff, but Necromancer has a lot more soloing style variety that they can pull from.
If you decide to go Necro, or want an idea of what leveling a Necro is like, and the soloing strategies we use (charming is one of the later game styles), read my guide here:
http://wiki.project1999.com/Uteunayr...Strategy_Guide
At the beginning of each level section, Fear Kiting, Root Rotting, and Charming, I give a long detailed explanation as to the mechanics of each style, and what it is like. It should give you a good idea of the variety you will have at your hands as a Necromancer.