Hmm. Well you’re smart to expect some flaming, as heartseeker spam hasn’t been considered effective in PvP for over a year (since it got nerfed right after launch). Hopefully you’ll also find some helpful advice among the replies.
It would probably be good if you mentioned what profession/build you are using. That would help people be able to give you constructive feedback about what you might be able to do to overcome the 2 spam.
Also, I assume you’re talking about 8v8 hotjoin, in which case yes, 8 of any build spamming stuff will kill anyone very quickly. You might want to try some 5v5 servers (you can see the player limit by mousing over a server before entering) or some solo arenas.