BitGamer has good freeleech torrents and they are VERY easy to seed on. The community isn't terrible imo. I prefer
BCG over all other games trackers are their content is phenomenal. Old games, new games, hell, they have it all :) A ratio free tracker (currently closed - invite wise - unfortunately) is "PwN Network" formerly nTorrents. They are as I mentioned ratio free so seeding shouldn't be an issue. The speeds are decent but not all torrents are well seeded. Seedboxes are definitely present on both
BCG and PWN but I don't believe they are so much on
BG. If you are lookin' for older content you may also try UndergroundGamer as mentioned by TehHavak.
BCG shouldn't be too hard to get a referral (their version of an invite) to these days, they are semi-open so just check opentrackers.net from time to time. If you have further questions about dedicated game trackers feel free to PM me as I am a fairly big gamer and would be willing to help in anyway possible. Also, if you would like a
BG invite visit my giveaway thread (in my sig) and follow the rules posted and I'll hook ya up for sure!