As with everything, the devil's in the details.

If your funding arrangement allows a minority investor to veto future fundraising, subordinate liquidation preferences, etc etc, they can kill your company.

Of course, most deals aren't on such onerous terms - but they do happen.

The level of control depends on the term sheet. As far as I understand, there is always a degree of control/preference, even when VC's share is minor. I haven't heard of term sheets that would give total carte blanche to the founder.