Hello!
Some excellent choices for characters there. If you want teams, you better play during "prime time" (that is, when people traditionally watch TV), as Defiant sometimes can be a little underpopulated.
Some people don't invite MM's because they lag too much, some don't invite Dominators because they want more "obvious" AT's on the teams. The usual direct damage dealers, healers/buffers. There is a strong bias towards Brutes and Corruptors in "some" teams.
I gotta tell you that my main character is a Mercs/Traps MM, and my best friend got a Plant/Thorn Dominator, as his main. Both are interesting, and IMHO well worth it. The MM is probably slightly better at soloing early on, but the Dominator gets quite strong at the later levels. As for team invites, they should both have a fairly equal chance, to get "picked up".
Hiya and welcome to the dark side of Defiant 
Hi!!!
And welcome...
To be honest i find that arch type helps u find and or not find teams, a stalker uualy u find solos alot which could be one reason why...
Im usualy on 4-8 player teams this maybe coz im in the most active 2 VGs in the game, or coz my global list is full.... or it may just be the arch typs i play,...
Anyway u welcome 2 team with me anytime, and the people i team with, and i find cors, mms, brutes are always being invited 2 team....
Play the game... dont get to serious...
And please all have fun thats why were here!
Miss Useful (main toon) Elec/Rock
[color=red][b] **Retired** [/b][/color]
Welcome to the Red Side. Now go roll a brute and really enjoy yourself..............
@Boy Wonder
Quantum Flash - Ill/Kin Controller
Leader of the Legion of Heroes
[ QUOTE ]
Now go roll a brute and really enjoy yourself
[/ QUOTE ]
Good advice that
Welcome, good you picked defiant
Have fun with your Plant/Thorns Dominator. It's an awesome AT and a great build . Anyone dismissive of it in their team is a bit, erm... ignorant 
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My Plant/Thorns eats mobs and deals with aggro better than any Brute 
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More Dominators plz!
Welcome to the Darker Side of Defiant.
Should be tons of fun, playing with your Dominator. I have no problems getting teams with my Plant Dominator
Hi everyone.
I played CoH couple of years ago and eventually left but after a friend of mine gave me a buddy code I decided to check the dark side out.
I made a plant/thorn dominator, mercs/traps mastermind and so far (only leve 8) both seems fun.
I wanted to just say hi and ask about the pve/pvp of Defiant villains side. How crowded is the 10+ areas? So far I could find teams without so much hassle but my friend (level 19 stalker) complained the 15-25 range is rather lonely.
Which of my toons would you advise me to play to be able to find teams easier? I don't have a problem with solo but if possible I'd rather play with people.
Thanks in advance.